Originally Posted by
Rich11111
Sure tell her her she can have sex with him, just make sure to tell her not to come back after.
Even if she doesn't have sex with him, to seriously consider cheating when your only four months into a relationship is a clear sign that it will fail.
I say end it. If she is this eager to have sex with someone else at this point in your relationship, knowing how much it will hurt you, i don't see how she will remain loyal to you if this becomes long term.
Break up with her now and save yourself a lot of heartbreak.