Why do some guys do this? Going back to their ex-girlfriends?

well thats true he was still hung up on her that why he went back to her, but i think he like you too ,but that made him really think . he might be with her right now but i bet he thinking twice about you. guys are pretty much stupid when it comes to mix feelings. they become very confused. he just still hung up on want he and his ex had,but that probably be soon over with.