KimLikesBigOranges wrote:
He's choosing to be with her over you. If he wanted to be with you, he'd leave her. Simple. Also, do you want to be with someone who acts like that with other girls when they're in a relationship? If he'll do it with you, he'll do it to you.

This.  And as my Grandma says,  "He wants his cake & eat it too."  He's a dog.