Most Helpful Guy
1) He might be perceiving signals you want him back he knows you probably don't.
2) If you're still finding ways of staying in his life but he's not over you yet, he can feel like you're messing with him making it impossible for him to get over you.
3) Maybe he feels you misled him in your relationship, he thought things were going really well and you broke up with him and he didn't see it coming.
4) Or maybe you're behaving differently after the break up than the girl he knew and it's messing with him because he didn't think you were like that.