I like this guy but scared about ruining our friendship?

So I like this guy and have done for a while, I met him and he was just one of those people you just click with instantly but we have never really made it past being friends.

He has mentioned before being in a relationship scares him (I think he had a bad relationship in the past) so he just avoids them altogether and I don't mean the player type either.

He also seems to have this weird friendship with a girl that almost borders on being a relationship in how they act so it is hard to really figure out what is going on with that. I know they are best friends and nothing more but... the closeness of them makes it feels like making a move would be kinda out of line.

And like just in general the guy is really sweet, he spends money on me and really insists I don't pay him back (not something I look for in a guy but I find it kinda cute, I always insist on buying him something in return even though he insists I don't) and most importantly he is there for me when I need him most, when I'm having a hard time I know I can count on him to be there for me and well he goes through a lot of similar crap too so he kinda gets me in a way some other people just don't.

I just don't know what to do cos I really like him but I don't want to make our friendship weird either as he is someone I value as a friend.

Any advice?