Never dump them just because they cheated.... After all you will just end up with another cheater...
Can you imagine "loving" someone and then they go get the shit fucked out ofthem and have the time of their life.. and instead of being happy for them, you DUMP them..

doesn't sound like love to me..

now don't get me wrong.. I don't have this sht mastered.. and I know it can hurt like a motherfucker to know that your lady is fucking your best friend...

But LOVE.. LOVE is LOVE.. Love is NOT "I am dumping your ass because you had an orgasm with soemone else"