There's a guy I work with, who I really like. He always flirts with me. My friends at work have told me that he looks for me when he gets off the elevator. When he sees me he always has a huge smile on his face. Sometimes he blushes when we talk. He knows I like him, because I pretty much told him.
After he found out, he told ask my friend at work how to tell me he's sorry, he has a girlfriend. So naturally, I was a little embarrassed and figured that would be the end of that, right?
Wrong.

He continued with the behavior mentioned above. But instead of letting me ignore him, he asked me why I wasn't talking to him anymore. He started using my name a lot in conversation. Saying, Hi Michelle, and Bye Michelle every time he walked on or off the elevator, and I was in earshot.
He has made it a point to talk to me everyday we've worked together since he found out I liked him. He is exceptionally nice to me. He opens doors for me at work, which honestly, get's on my nerves. But still, why would he treat me like I'm special after going out of his way to make sure I knew he had a girlfriend without telling me directly.
If I don't smile at him, or don't go talk to him, he asks me why I'm not talking to him anymore. Even if it's just for one day.

I guess I just want to know why someone would act like this. Part of me wants to believe he likes me, but I know he has a girlfriend and I feel bad about talking to him. Part of me thinks that he just likes the fact that I like him and enjoys the attention I give him. It's just so difficult to ignore him and get over it, if he's going to go out of his way to make sure I talk to him, you know.

Some additional facts:
He's ten years older than me. I'm 21.
He has a girlfriend. They've been together for 3 years according to what he told my friend at work.

It may be that he is getting an ego boost. It may be that someone else is putting words in his mouth.

I would talk to him and clear up any misunderstandings and confusion. Let him know that his attention is inappropriate and why. He is being a distraction and that should be stopped. Also, be honest and let him know that you find it annoying to have him open doors for you. Some people don't mind, some do and you can learn a lot about a person's personality if he/she refrains from doing something after you point out the irritation.

I agree with Cat---You need to nip this behavior. Just be polite, but professional. Say good morning, and then don't engage in any other conversation with him--period. That should hopefully take some air out of his balloon.

As to opening the door for you, some men just naturally do that for woman. I have taught my son, and I expect him to open the door for any woman, its just old fashion manners. Its up to you to mention how this irritates you.

Take care

Yeah, you both are absolutely right...
I guess he's making bridge for future, may be he's so insecure about her present girlfriend and you're her best nearest option to choose. Already you've expressed you're to him, and he's now so relax caz he's in demand for you. He's sure that now or later you'll accept him if he comes to you. You can bend a small plant easily but cannot after it grows to a tree. Very politely show him his limits. You'll be done. Good Luck.