What should I do?

I have been on and off with the same guy for a couple years. We always stay friends after we break up because he's cool and fun to be around. Him and another girl were talking for a bit but now he told me they just talk in the halls. Him and I have been trying to get back to how we were when we dated. He took my virginity the other night and we're not together but now I want the other girl out of the picture completely. What should I do?