Would you hang out with someone you weren't interested in?

I probably wouldn't, because I wouldn't want to lead her on. I'd only hang out with her if I liked her too.

Personally if he hangs out with you a lot then I think he's probably into you, in my experience most guys approach 'platonic friendships' very differently to females, we don't often befriend girls we don't secretly fancy or have some other motives for hanging out.

Sure, why not? If a guy likes you as a friend then he'll tend to pretend you don't like him. Not trying to ruin your chances, you just haven't given much info.