My roommates have been complaining that I’m cheating. I don’t know what they mean.

I have a roommate who lives with me who also happens to be a huge douche canoe. They’re all very nice people, but one of the complaints I hear from them is that I am cheating on them with a guy who lives with me but doesn’t know about us. They’re all very nice people. I think it’s hilarious that they’re all so nice, then they all come out and say it in a bragging tone. It’s kinda funny to me.