Problems with guys

Chelsea • The name is Chelsea! I`m 16! I`m inlove with Tyler! He`s my baby.
So I have a best friend and he has a girlfriend. I really like him a lot and trust him with my life. He's always so sweet to me, but I know he likes me too. He has told me before. He trusts me more than his girlfriend and can tell me stuff that he can't tell her cause she'd flip out on him. I'm not sure what exactly I should do about it.