Okay so here's the deal, my best friend used to date this guy that I've known since like 5th grade but never really got close with him until this year. She was in love with him for months, & they would date on & off for like 4 months, then they finally broke it off & just became friends. But then, about a month ago he started to date one of her other best friends and she was crushed. She basically cried on my shoulder. But now I think I'm starting to fall for him. And she doesnt know this but, we're kinda friends with benefits.. We send pictures back and forth to each other like every night and we're very touchy when we see each other, nothing too serious. But I kinda feel bad now that I'm going behind her back like this. What should I do?