I think im in love with my best friend

i get jealous of him liking other girls and have been talking him out of sleeping with a crazy girl he says he hates that acts like a little kid.(even if I didn't want him this would end badly for him) And I've realized it's because I want him and I want to be there for him no matter good or bad days. problem is I'm in a relationship I've been trying to get out of for years but keep getting guilted into staying despite telling him I don't think I love him and don't want to be with him. I think my best friend might like me as he's always been there for me and comes to me for advice and for comfort when he's sad or needs help solving a problem and he frequently slips in vaguely sexual jokes and says he knows my bf probably isn't pleasing me and treating me right and that I know and deserve better. I know cheating is wrong as my bf cheated for years (best friend was there for me the whole time) so I've been avoiding him besides giving him advice through text but I cant shake the feelings and want to see him and be with him. should I just be honest and risk ruining the friendship? what should I do???