well to be honest you should dump ur boyfriendunfaithfull.
you should try asking your boyfriend to talk to him
If this person is truly your best friend, you should be ok with them knowing so go ahead and flirt! XD
Make a choice.
No.
Flirt! : )
That would be a real back stab to say okay, I don't think you should.
Because you slept with your boyfriends best friend.
Nothing it's not your fault
No. Just tell your best friend that he is taken. It is her decision from there.
If you have feelings for him still, let him know
well he looks at her alot talks to her alot
just ask him yourself