Relationship problem. Ds. help me out!

We are in a relationship for 2 years. Recently he started crying over his ex. He doesn't want to go back to her,he doesn't want to break up with me.sometimes thinking about marriage, I'm from North,he is from South..he is afraid wat if his parents won't accept me.after dat he starts to avoid me ,stops talking.dn he becomes normal after few days.dn again thinks about marriage. I asked him to go back to his ex if he wants her n he becomes Happy. He got angry vd me. Idk wat he wants.crying over ex, doesn't want to leave me.. making things more complicated . I don't know wat he really wants. Y is he doing this. He is telling his friends dat he is worried about future,he can't hurt me in future if his parents won't accept,so he is behaving like dat. To me he is showing he is missing his ex, putting status for her, trying to call her. All this made me think that he wants her,so I asked to go back to her,if needed I VL talk to her.i want him to be happy. He gets angry on me for ds.help me out