Some relationships survive or even thrive with outside partners. What are your mutual boundaries? It doesn't sound as if you two have dealt with the topic yet. If so, not good. The fact you know your gf wouldn't be happy about what you did means you're in a jam. Still, ask yourself what's left of your relationship without trust.
For me, cheating implies "outside intimacy without agreement". That's just a physical form of lying, and lying is a very secure nail in the coffin of any relationship. Often the hardest thing to recover from. You have a very small amount of wiggle room here since you didn't actually screw the girl, but I'd use it to recover and communicate instead of trying to bury a skeleton. She might surprise you and you'll expand your activities. You'll at least come out with the lesson and your self-respect.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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