So I'm in a pretty bad situation ...

Okay so I have a boy best friend that I think I'm inlove with .... we've had sex six times since we've been messing with eachother . No one wants us to be anything because everyone thinks that him & his ex go back together cause she lives with him ... only because she tells his mother that she's having problems at home with her mother so mother took him in , I just lost my girl bf because she feels like im choosing him over her ... & now I don't know what to do .. im not about to kiss her ass any more & I don't wanna lose nether one of my bestfriends over petty things... please ladies any advice ??