Datign A Guy You Know Is Taken

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I recently met this guy through a friend of mine. I know for a fact that he has an on-again off-again girlfriend. I am also in an on againoffagain relationship. I think I kinda like this guy. Would it be a wrong thing to show interest in him? Realistically he'll probaably never leaver his girl and I'll probably never leave my guy. Is it even worth it. Has anyone else been in this predicament?