If you can forgive your sister, you can forgive your boyfriend. It doesn't necessarily mean that you should stay with your boyfriend. Cheating is cheating and if that is not acceptable to you, you should find someone who will respect that wish.
You should tell your friend that he is cheating its best that she knows.
You obviously have some knowledge that your boyfriend may well cheat on you. However, some young women are jealous and may feel their boyfriend is cheating because they may have heard from one or more of their girlfriends that their boyfriends have cheated leaving you feeling vulnerable and therefore you are suspicious of your boyfriend. He may well not be cheating on you at all and if you don't catch him red handed there isn't much you can do about it. If he is innocent then his statement that he knows someone else who is cheating could very well be true and you should have asked who it was and this will give you the opportunity to tell him you ever caught him cheating that you would break up with him for good.
if u think ur bf is cheating on you and then he will have a fit about it.
because they're cheating!
your boyfriend
The only way you will know if and where your boyfriend is cheating is either ask him straight out (he may lie about it) or, take a girlfriend with you on an evening he should be with you and follow him.
Address him about it face to face.
Yes, and I'm ashamed on you for cheating on your boyfriend with his cat.
You should tell the other girl and both break up with your boyfriend.
stay with him forever. its his way of showing that he loves you.
well ask one of your friends to ask him if he was cheating on you and if not then it was probably just a rumor or something but if he was cheating on you then u should totally dump him