Most Helpful Guy
meh, it's not really a big deal. you see, guys don't have the same notion of "just friends" as girls do. girls can be just friends with guys with no problem and do all sorts of stuff like going to a movie, shopping, having huge ass conversations etc without feeling anything more for the guy. (at least that's what happens most of the time)
on the other hand, guys tend to do stuff and get presents only to people who matter to them like, a lot. so if you're a girl, and he has a girlfriend, and he doesn't plan on cheating or keeping you as a safety net chances are you don't mean too much to him, or at least not as much as his gf and he doesn't want to invest in your relationship because he knows he'll grow fond of you and he doesn't want that.