<human>: Can you summarize the given text in a few sentences?

We met on OkC, and we've been dating for 6 months. She told me that she was going to keep her OkC profile open to meet friends (she only has a couple). 

She's changed her status to In a Relationship and put New Friends as her only "looking for" section.

The issue is; I've seen her messages (she left it open, I wasn't snooping, although admittedly I looked at it longer than I should have), and 95% of them are single guys clearly looking for sex. 

She's going out with one of these guys tomorrow (she showed me his profile, but not his message, he seems okay but is also looking for casual sex/relationships as well as friends, and he's definitely her type) and I feel hugely insecure about it. How can I bring this up without seeming jealous or controlling?
<bot>: Girlfriend keeps her OkC open for friends, but they all seem to be single guys looking for sex, not actual friends. What do I do?