Advice!!! I don't know if this is a signal or not !!!?

Ok so there is this guy and we talk all the time but on Monday we were talking about like our sexual past Nd stuff Nd he told mr everything he's done but I haven't done anything cuz I'm still a virgin. So I was like I would give a bj ( Ik some people are gonna say some rude things about the bj part just don't comment) and everyday he sees me he's so shocked that I would do that Nd stuff. Nd he's a quiet person but he's always talking to me and when he sees me he does thing with his eyebrows Nd does this smile. Oh yea Nd he has a girlfriend!!! He's my friend Nd all but idk he's cute but Hm idk!!! Nd I sometimes catch him lookin at me Nd he looks away quick or he gives me a smile.