Should i stay or should i go?

[Insertnamehere]

1) What do YOU want? Make up your mind about that. Do you want him as a partner or a just friend.

2) If it's the first, you can't do much. He's with someone else, so he is inherently off limits.

3) You can either remain friends with him, enjoying what you have or cut ties if you can't deal with being just that.

I don't know. I can't really tell if he really likes you or not, but for the moment that is irrelevant, as he's taken. If he wants to pursue something with you in a romantic way he shouldn't be with someone else.