Here is the way I see it:
If a guy is friends with your girl, and she's a hottie - chances are, he wants to fuck her. The key question in this scenario is whether or not she wants to fuck him as well. You have to trust the fact that your girlfriend cares about you enough to not screw around behind your back... and if she is committed to your relationship, chances are that she does. If you can't trust her commitment... why are you dating her in the first place?
You don't want to come off as insecure about this, it'll only make her more likely to cheat on you.
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