Sadly, since you didn’t see for yourself, you can never be fully sure that you got the real story. But the bottom line is you need a boyfriend that you can trust. If you stay with your BF, are you always going to wonder if he’s telling the truth? Will you continue worrying about whether or not he’s cheating on you with someone else? If you’re being driven crazy, then is this relationship really worth all that stress? If you feel like you can’t trust him, it may be better to fly solo. Go with your gut on this mind-boggler.