If you discuss it with her and it becomes clear that she's not looking for permission, but for approval (in other words, he's staying there whether you like it or not), do let it escalate into a full blown fight.
Do you trust her? If so, prove it. If not, what the heck are you doing with her anyway?
I'm not saying it's cool that she's having a dude crash at her pad, I'm just saying that getting riled up and causing a commotion will only give her and him something to talk about while you're not around. That thar would be the beginning of the end.
After he's gone, you have a talk with her and say that it bothered you, but that you trusted her. Besides, anybody with half a brain can get away with cheating, so if you spend effort looking for clues, you're just going to become paranoid and convince yourself that she cheated.
But seriously, unless there is a money or location reason for this, it's kinda uncool. Moreso if she lives by herself.
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