My bf cheated me with his ex.?

So me and my bf been together for 2 yrs and I just found out that he was talking to his ex not really consistent but occasionally but when they talk they're been sweet to each other, my ex bf really want to see her, since they are long distance relationship. In these 2 yrs I can't find out that he no longer love me and feelings for me beside he loves me more than b4, we do strong feelings to each other. He even telling his mom infront of me that he will marry me. I know he loves me. But it seems that he can't give up his ex because i feel that he was regret of their relationship. And when I found out lately that he ask her if she wants to travel with him I dump him quickly. He said he dont have feelings to his ex but he still want to do something with her and still will fulfill his promise to his ex. But he told me how he was regret of losing me that he loves me but not trying to hold back knowingly he's not worth for my love. But he still hoping we will meet each other someday. What should Im going to do? Move on?????