How to make a Player commit only To One Woman?

We broke up with my boyfriend last November after I found out he was cheating on me and lived a girl in another city. We are in a long distance relationship.

He said, he missed me and loved me. He wants to meet me. I stalk the girl and found out they broke up already. I have to meet him too to return his things.

I still love my boyfriend but how do I make him commit only to me especially he has this playboy nature? How should i act towards him so that he will take me seriously?
How to make a Player commit only To One Woman?
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