Guys, Is it possible to get a guy to leave his girlfriend for a side chick?

So this guy and I have been messing around for like 2 weeks now. He stays the night... He eats dinner with me and my sister and is soo affectionate with me. He loves kissing me and holding me. I recently just found out that he has a girlfriend. I was disappointed because I really like him. We make each other laugh A LOT! We have fun. So my question is, would he leave his girlfriend for me? I happen to think Im smart, funny, super nice and pretty. But will that be enough to get him to be mine?
Updates:
+1 y
He was single. They were in the process of breaking up... she lived in a different city from us. He does text me to come have dinner and stay the night but I haven't replied in a couple of days.
Guys, Is it possible to get a guy to leave his girlfriend for a side chick?
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