Hey jonmich,
Ok, here is a question to ask yourself: If you really were happy in this relationship -- would the thought of having sex with another girl even cross your mind? I don't know about you, but it wouldn't mine. Are you sure that being in this relationship is where you need to be? It sounds to me like you need to rethink what you're doing here.
It is not OK to hurt someone else by sleeping around. Believe me, what goes around comes around, and someone will find out sooner or later. Is that what you want? If not, then get out of the relationship and then follow up with this other girl if you want. But please, respect this girl in your life enough to end this relationship first.
If you love this girl you're with, then stay with her. But staying committed is the most important... not just you being with her.
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