i think it's just a trust thing. have you done anything to make her think this?
go on maury and prove it.
There is no actual way to prove this. You just have to try and convince her by being nice and romantic and not cheating. Apart from that all you can do is hope for forgiveness.
Kiss him in front of everyone then smack all the other boys hard in the face. *EDIT You Shouldn't have to prove yourself. He should Believe You, Trust you enough to be able to take your word for it. Did you know, That if there is know apparent reason for him to bring it up that your cheating on him, that there could be a chance that he is Cheating on You? It was in some article on the internet. It's Because if your boyfriend is cheating on you, and you haven't realised, Then he thinks its so easy for you not to notice, then He thinks that you could be doing it on him. Ya Digg??
Make out then they'll know for sure!
If you aren't cheating on them and want to prove that then I'd suggest discussing it with them. Try not to get defensive or angry anytime you're talking about it because a person can take that as you being defensive because you're hiding something. Ask what they want you to do to prove you're not cheating and be willing to do those things, within reason, to show you're trustworthy. Ask what makes them think you're cheating too. If there are specific things that make them think that and you can explain each thing it may help to squash their suspicions.
He will forget about you and he will keep it a secret.
Prove to him that you aren't.
If it is so obvious to your boyfriend then have 'him' prove it. He should get his facts straight before he accuses you of cheating. Let him do the leg work and you know the truth and tell him so.
not unless u can prove it
prove it to him by kissing him
His lips are moving. On a more serious note, although the scent of another woman's perfume or a hair that doesn't belong to you on his clothing, even lipstick on his collar do not prove he is cheating, he may be. Confronting him rarely yields an honest answer if he is actually cheating. Hiring a private detective is the best sure-fire way to prove whether or not he (or she) is cheating.
Prove them WRONG!