I have soul custody of our two kids 15 & 14 and their father has just starting to see them again for the last three months. The last time before this was about two years, fore the judged told him that he would never have them over night again. I never thought that I would ever feel the way I did today. It was like I was visiting someone that I knew that had older kids. My own son just walked by me and did’t even realize who I was. He would always yell out hay Mom and he was not even talking to me. He did not even want anything to with any of us not even his brothers. It is like there is something holding him back from recognizing us. I feel like I have lost my son and I don’t know where he is. I always wanted to bring my children up not judging people by the cover and know that is bitting me in the . Every time that they would come home anger and mad at their father, I would tell them that they don’t know what really happened until they see him and ask what happened. Sometimes there is more to the story then the cover, something could have come up within the last minute. Now when I look into his eyes he can’t even look back.
What hurts the most is when he did not even want to say good bye or even put his arms around me to give me a hug and kiss. I just don’t know what I did wrong.

Well this sounds somewhat normal for a 15 year old, many will not want to even act like they know you at the mall, or when they are with their friends, they are feeling grown and want their own life and less control and at 15 hugs and kisses are almost always a thing of the past.
So without knowing exactly, this could be a normal stage also

I am so sorry, I can feel your hurt.
Please consider that he is only a child ( even if he thinks he isn't). I have found that a child will do anything to seek the love of the parent who has done the least for them.
I think that the fact that he feels safe in ignoring you because he knows you will love him no matter what happens, is a thing that you should consider. Another thing is ,I feel that when you never said anything bad about Dad, that works for you. I would bet that in a while he will give up on this man and come back to you.
This is only my opinion because I do not know the whole story, but I have seen this happen quite a lot. Hang in there and keep being you.