Should I even hang out with him?

There's this guy who's my best (and only) friend, but I feel like he just hangs out with me because I come from a fairly wealthy family, so whenever we travel, I usually bring him. But it's like he's starting to invite himself over, and whenever he's depressed, (he has a really tough life) he tells me that his girlfriend theat he met online, never seen in real life, and always is yelling at him and making him upset, he says SHE is the only reason he hasn't killed himself. THe only times he really cares about my feelings is when he knows I have a trip coming up, and he knows I really like him, but it seems like he rubs the fact that he's going out with is stupid online girfriend and not me into my face.... I'm always there for him, I help him out when he's upset, I never criticize him, and I try to never talk about my problems to him because I'm scared he'll think I'm just complaining. He is my only friend, all my other friends starting making fun of me and ignore me. ...but is my friend actually my friend, or does he only like me for all the traveling?