Sorry but what makes you think that he won't do the same thing to you again. This is a guy who wants his cake and eat it to.
You need to move on with your life this is going to go no where for you except to keep getting you hurt over and over again.
I have no idea if you ever watch Dr Phil (I catch it here and there) but I love his saying "the best predictor of future behavior is past behavior" that sums it up in a nut shell.
And to me it sounds like he is playing both of you at the same time. Maybe his other girlfriend finally got wise to the situation and told him to take a hike so he is running back to you because you haven't told him that yet.
So I hope for you sake that you also tell the jerk to get lost. And if this guy is sleeping around how do you know that you won't get something you don't want from him.
