I have a gf who I'm considering marrying at some point, however, I don't feel we are on the same page as far as boundaries with the opposite sex. She is in nursing school and has male classmate friends who text or call her for mostly school related things. He called today on Christmas eve at around 10:30pm to talk about school and say merry Christmas. They also text back and forth about school even at midnight. I actually trust her and don't believe there are any bad intentions, but I still don't think it is appropriate. When I try to discuss it with her, she pretty much just keeps saying I don't trust her. She says the guy is half her age and is possibly gay. I really don't are what he is. I feel she should lean on female classmates if she needs support. Any thoughts?