Girlfriend drinks with other guys alone?

Anonymous
So a girl (21F) that I (27M) have been in a relationship with for a month went away on a short family vacation to her hometown. When we met when she got back she told me she was with several guys and her alone and one of them invited her for a drink and the other guys came along. They got drunk.

I didn't ask where they drank - it could have been at the beach or outside or possibly at a home. She didn't mention it until we met (apart from saying she got drunk the previous night via text), but she sent me videos or her and the guys out in the day the previous day. For the record, she has known these guys since she was 14.

Is this bad? Or could the fact she is mentioning it be a reassuring sign because she is being open about it and since the other guys came friends came. I didn't want to pry too much or seem controlling, but I am having some second thoughts/weird gut feelings about it (or overthinking?)

On a side note, she also has Borderline Personality Disorder and has been in treatment for two years and told me when she first started dating she has gotten better (BPD has sometimes been linked infidelity but there's no scientific link - but this has made me overthink a bit more).

Any general advice is much appreciated. :)
Girlfriend drinks with other guys alone?
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