Yeah me too
What do you think, if Ian didn't go with her that night, would she fuck Axel in the club/bar?
For now, i think she doesn't even consider Ian as someone she can be in a romantic relationship or even have sex with because he is a very good friend to her and her BF... but the thing is that she lacks attention from her boring life and her boring BF, she knows that she is beautiful and that she deserves more excitment out of life other then sitting at home watching Wade playing videogames all day long.
So for me is exactly the same, if Ian can't be with her later down the line, he will do everything he can to protect the naive but beautiful blondie