One of my closest friends (a girl, 19) currently has a friend with benefits who she is very deeply infatuated with, and I think he's just using her as a quick shag whenever he wants one. I wouldn't be too bothered about this if her feelings weren't involved, but they are, so I feel I should help. Some opinions please?
They've known each other a few years but only over the last few months have they actually started getting closer. She had a crush on him for a while but with her being the person she is she had regular crushes on others, so I never really thought anything of it. They got a little closer as friends until one day he kissed her, and a few weeks later they became friends with benefits. As you might expect, feelings got involved pretty quickly and they soon became "technically in a relationship". I'm fine with that, it happens, but one thing gets me. They barely talk, and the few times I've seen him away from her she's not been mentioned at all which struck me as profoundly odd for a 'couple' who apparently like each other very much in their position. I found out the other day that when they do talk he only really says things like "I've really missed you" and "I want to see you again" which in itself is nothing particularly worrying, but the fact is he won't speak to her apart from when he says that, knowing he'll get a shag when they see each other.
She's got her feelings terribly tied up in this (it's the first time for a long time she's not moved on within days/weeks, and her moods change massively dependig on him) and it seems to me that he is only using her. He sees other women, but I don't know how much they get up to. Has anyone got any opinions on if he is using her, and how to help her out if he is?