I really need some help with this and it would be greatly appreciated if I could get some answers.
Here it goes.
I had started working at this new place (I won't say where, to respect the privacy of others) and I was extremely stressed to start. I would be working outside, with three other men that I didn't know. This made me uncomfortable, because I am a skinny guy and I am very shy and quiet. Well, when the time came for me to start, the three guys I would be working with, came to meet me in the main office. Naturally, they looked me up and down, judging my every feature, but one of them stepped forward and sat across from me smiling.
I noticed that he was pretty slender too, though not nearly as slender as me. He started asking me friendly questions, where I was from, my age, where I had lived. He was very kind. Anyway, long story short, he and I became close friends. Him, being 11 years older than me, didn't seem to bother him at all. He referred to me as and introduced me as "His good friend."
He would ask me for advice, I the same for him, and we would talk about usual things.
He and I never argued, never fought, never got mad at each other. It was a real healthy friendship. I did however, start to notice a change in his behavior at one point. He began to get really protective over me and he started to drop small hints. Whenever someone was rude to me, he would glare at them and start chewing them out almost like he wanted to tear their head off. He always went out of his way to be around me and often times, would want me to just relax and talk to him and take a break from work. These "hints" were subtle, but dirty. What I started to get from them, was that he wanted to sleep with me. This wasn't just in my head either, it was obvious.

I didn't think anything of these hints, or take them to heart. I am a very open person and it is impossible for me to judge. I put them to the side and just continued being his friend.
Sadly, I was laid off from this place. He still talked to me all the time, would invite me to his house a lot and would get excited and happy whenever I would call. He and I however, never managed to spend any time together. It was all phone calls and text messages.

Well, one day, he texted me and asked me to come over the following day and spend some time with him. He told me that he was bored and he missed seeing my face around. I agreed and it was decided that I would go over to his house after all my errands were finished. So, the following day, when I was free, I texted him to let him know that I was free the rest of the day and to let me know when he wanted me to come over.

That was it. I never really heard from him again. He would text me once-in-a-while, usually short, one-word replies to questions I was asking him. Rarely, did he ever make an effort to talk to me. His messages started to pick back up a little bit, but suddenly stopped.

Now, I can't get him to reply for the life of me or to answer his phone.

So, I have slowed down on messaging him.

What I need help with, is understanding what I did to make this happen. Was it even something I did, or was his attraction to me scaring him? This man did have a woman and a child with her before he met me, so I could understand his being uneasy when he suddenly feels this attraction toward another man, but it makes me sad.
I have tried so hard to talk to him and to show him that I am still here, but it seems like he doesn't want anything to do with me anymore.
I can't just give up on him either. This man helped me through a broken heart and a major cancer scare.

Is there anything I can do to fix this? I really cannot lose this friendship, but this whole situation is tearing me to pieces. I'm tired of being sad over this and I'm tired of beating myself up, but it seems like, no matter what I do, everything refers back to him.

It breaks my heart and I just don't know what to do and I can't stand to hear (let it go, there's nothing you can do, you need to end the friendship.) I can't just end the friendship, because he has given me no reason to hate him. Obviously, he has his reasons he won't talk to me, I just wish I knew so that I could stop wondering.. .

Have you asked him point blank what went wrong, what you did to alienate him?

I have asked him if everything is okay and told him that I am worried about him. I know something is bothering him, I just wish he would tell me so I would help him. I am going to text him around six and ask point blank though, if I did something to make him mad. It just hurts, I cannot lose him as a friend. I'm not sure what I would do if I did. I really, cannot think of anything I could have done to make him mad, except maybe annoy him or not going to his house when he asked before, but it doesn't make sense that he would quit talking to me the day we made plans to hang out. I just cannot wrap my finger around what his problem is unless something bad happened to him.
But, that is why I need him right now. Some horrid, absolutely horrid things happened to me this year and he is the only one who would understand, but he won't talk to me, so I can't tell him. These are things that he would want to know and when he finds out, he is probably going to be mad that I didn't tell him sooner.
I need to know what I have to do to get him to talk to me again, I cannot take this anymore, it's driving me insane.

I don't know what time zone you're in. Please let us know what he texted back to you, or if he even replied.

Well, I didn't get a reply, which doesn't surprise me. You see, this is highly unlike him. He always went out of his way to talk to me, obviously, something has gone horribly wrong in his life and it has clouded his judgment on everything. It hurts me to see him like this. He is normally open to talking and is always happy, but last time I talked to him, he was pissed about something.
I really don't want to give up on him. I know that he needs me and I could never tell him off. I want to keep texting and calling occasionally, to show him that I am still here and that he can count on me. I really look up to him and I can't imagine what I would do if we just quit being friends, especially when there is no logical reasoning that I can see.
I can't stress this enough when I say that I really NEED him in my life. He helped me through so much crap, this is hurting way too much. I am wondering if he is afraid to talk to me now. If he is scared that I am going to be mad at him.. . Oh, my god, I wish I knew what to do.. .

What if the attraction was sexual, and he was grooming you to be his secret lover. Would you still need him in your life??