you can tell be spying on them!
First off take the time to think about who you are, and that you aren't overly jealous and second-guessing scenerios re your boyfriend and other girls. If you feel you have good cause to doubt where he is and with whom, then communicate this to him! Of course there is no doubt between us that he will deny every single bit of it if he is guilty, but look in his eyes (the windows of our souls) and if he isn't looking you in the eye, or his body language (shaking, red in the face, shifting from one foot to the other or turning his back on you) then he's lying! Tell him if you ever catch him cheating (and you will) that's the end of your relationship. Tell him the ball is in his court and you'll be watching! Remember, now you have put the seed of doubt in his mind and he won't be so sure of himself if he is cheating.
If you really think he is, the other poster said it .... "spy on him!"
Good luck Marcy
Ask him :/
You tell the truth and accept the consequences.
In most cases if a boyfriend was not cheating and was accused by his girlfriend then he would be angry and since your boyfriend is silent there is a high possibility he is cheating and cannot own up to it.
No. Blackmail would be if you went to the boyfriend and threatened to tell on him unless he paid you something.
Tell him the truth, say you like girls.
You should tell your friend that he is cheating its best that she knows.
Ask them!!! And if you are wondering they probably are.
Well he might make excuses to not hang out with you..
You can just tell her if you don't want her to be anymore.
He's either cheating or watching strippers
Lie and tell him you cheated on him... he'll tell you just to get even with you.
Just tell him everything.. and hopefully he will understand and appreciate that you told him.