I go to a small school with a very limited selection of high value girls. Being virtually the only alpha, I have first choice on any girl in the school.

There's this one girl I've been particularly interested in but there's a problem(s).

The first problem would probably be that she has a boyfriend, but I don't see that as the main problem (High value girls are almost never single).

She's been showing a lot of interest in me and finds any way possible to touch me or talk to me when I see her. However, whenever I bring up something intended to escalate she hits me with the same line, sometimes reworded,

"I'm not like that" "I'm not that type of girl" "You can do that with your other girls"

I usually just laugh and say "we'll see about that". However, it's been made clear she's looking to me as a LTR option, where as I'm only looking for a "once a month come over and chill".

How do I go about this to convince her I'm LTR material so she can get rid of her boyfriend and be in the position to branch swing, without committing to her and giving up the other plates I have spinning at school?