Could girlfriend lose interest while on vacation?

My girlfriend is on vacation in Boston for a week with two of her friends that really don't like me. I am worried that they might say really bad things about me and her lose interest, but at the same time I am thinking that if they had bad things to say about me, they would have said them awhile ago and she would have already lost interest, or just not cared what they said.

I really need to know cause it's really bothering me.

Thanks for the input !
Could girlfriend lose interest while on vacation?
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