In many cases the person accusing the other of cheating has either had a bad experience with someone else who cheating on them (even a parent or both parents who cheated) and they assume the person they are with will cheat on them as well or, the person accusing is cheating themselves and feeling somewhat guilty about it. Since you are not cheating on your boyfriend you have nothing to prove and if he cannot see you for the trustful person you are and you have discussed this problem with him then it would be wise of you to break off the relationship or your life will continue to be miserable.
