1)Either he is just a flirt. Maybe he doesnt realize he's doing it. And you could be taking things as flirting when he didn't mean them that way.
or
2)He truly does like you.
If he eventually tells you that he likes you, then I would be careful. If he flirted with you when he was going out with another girl, who's to say he wont flirt with a different girl when you're with him? Also, alot of guys during a serious relationship will begin to flirt with other girls because it's new. They've gotten used to the old, and are attracted by something new.
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