Would you let your GF sleep in the same bed with another guy?

[Emperor]

Cmon now... Peachy probably dates men who are confident enough in themselves that they don't care what Peachy is doing, or whom she is doing it with....

Also these kind of men are too busy with the line of naked women to their house to worry about what their girlfriend is doing...

Obviously No one here fits this description as everyone is telling OP to TAKE ACTION. Only an unconfident weak man lets a woman control his emotions or actions...

When she asked him if it was ok, he should have responded, "Sure baby its ok! Why wouldn't it be?" then lose her phone number, not answer her calls, and break out the lil black book... If she shows up at your doorstep begging for forgiveness, THEN maybe you give her a second shot. Until that happens.... ENJOY! (your new freedom)