Most Helpful Girl
First you have to accept that you can be cheated on again if you have her back
If you're ok with that all you should do is tell her that you forgive her and want a fresh start
Most Helpful Guy
By all means take her back if that's what you both want and it's a first offence.
But do so with a clear heart, start again with the relationship, and take it slowly.
Otherwise, so dump the hoe.