S_rocc said:
How should I go about this? Sit next to her from now on and build rapport? Get her out? Not even bother and befriend her? Haven't had much experience with girls with boyfriends
Your're lucky this is almost a problem for me. You asked her out but what did she say? What was her reaction/body language, what else did she say to you? If negative, move on and do not game girls in your class by going direct instead indirect-direct because you have to see them every day. Search for the article on indirect-direct for more pointers on how to do this better.
If positive/neutral ignore her comment about the b.f and game on as usual, if she keeps bringing him up it's a no-go because that pussy only belongs to him or someone better than him at the moment. Also don't try to sit next to her, it just seems needy/desperate on your part and always be engaging other girls in the class so pre- selection kicks in and she'll want you more along with helping you develop abundance mentality. If it's a go, say you are going for coffee, food, ect... at the school cafe and invite her along so it doesn't seem as a "date" and is low pressure for her to join you. Deep dive, try to escalate, the works, but by the looks of it you may need to work on closing also because closing a girl w/ a b.f can be easy or hard depending on how you approach it.