If you and your girlfriend are on a break and you mess around with another girl one drunken night should you feel bad about it even if there wasn't any sex involved?
I don't think it is a big deal. The only exception to that would
be if it were agreed that during the break, that you and your
girlfriend were supposed to abstain from seeing or being with
others. Otherwise if she take the chance of letting you go, she
must accept the consequences.