My bf and I have been dating about a year now. It is my longest relationship. Here lately, however, things just haven't been them same. We have seen each other less, talk to each other less, and his ex gf has came back into the picture. He claims he hates her and hasn't spoken to her in years. She and I have mutual friends on facebook. When I tag my friends in photos or posts, she "likes them." I mentioned this to my bf a few days ago and he seemed mad. He was with his best friend when we had this conversation- and I just found out his friends have added her on facebook after these events have occurred. Something just doesn't feel right about that. It makes me wonder if something is actually going on between them now. Why would his best friend add his ex that he supposedly hates, right after talking bad about her. I felt like it was for show. Should I be worried?