What if he's cheating on me with my best friend?

well I have this boyfriend we've been together for about 11 months now and am kinda getting this feeling that his cheating on me wit my BEST FRIEND, what should I do??

confront your bff with your suspicion. if your boyfriend is cheating on you with your bff then your bff isnt a very good friend. I would sit them both down and confront them about it. see were that goes. if they tell you that they arent together then one day follow one of them when you know that he/ she is going to meet the other and see what goes on. that should give you the answer. hope I helped ~kaitlyn~