My ex-boyfriend hates me. He's now with his own gf that broke up with him. Wth?

Just recently I broke up with my boyfriend. In the happenings he was like I don't care and all this shiz. Now he's back with his old girlfriend which doesn't bother me at all, but he just won't talk to me! Yah I know I broke his heart and I felt so sad before but my old old ex still talked to me and we became friends! I really miss you, Tyler.