Dude, you're dating "her", not "them". Everyone that gets to call themselves an adult comes with past relationship baggage (assuming that they're not hermits). So this chick is currently banging someone else and she's got you on the side. It doesn't matter what that someone else has between their legs.
If she were banging a guy, what would your response be? Why should this be any different? Are you comfortable breaking up a couple?
You're going to have to answer those questions for yourself. I'll just give you the standard warning that if she's cheating on her girlfriend with you, there's a better than average chance that she'd cheat on you. Not that she will, just that she could.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." - B. Franklin
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"We have met the enemy and he is us." - Pogo
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