What do i call this?

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okay so first off i'm 21 years old, I've been hanging out with two good friends of mine and always have my girlfriend come along with us, so basically I'm more attracted to the hot friend which his name is Sall, its like i seem them every night after i leave school or work and spend about 4 hours together or what not. we always end up kissing and you know what, and he kiss's my hands, its so cute how we are . we always chat and everything when were not with each other and keep in touch daily. my problem is that i don't know if this is just Lust or a crush that hopefully will go somewhere, we haven't talked about anything like about me and him so whats really going on, i need some opinions?? please!! i feel confused but at the same time i love spending time with him and don't know if i am going to fall for him fast or not because were close like this!,