Is it Acceptable for my Girlfriend to Stay the Night at a Guy Friend's House?

Anonymous
My girlfriend (20 years old, dating for 3 years) is staying the night at her friend James's house. It makes me feel very uneasy that she is staying the night at a 16 year old kid's house.

They usually stay awake until 2 or 3 in the morning, supposedly playing board games and stuff... I don't know, but I just don't feel comfortable with her doing this.

She has done this several times. She did not invite me to go with her. I just have a feeling that if they're not already "up to something", that they might be in the future.

I've heard the saying that guys and girls can't "just be friends", and I've seen

Am I right to feel that this is not acceptable behavior for someone in a committed relationship? Should I talk to her about it, or just let it slide? It really eats me up every time she spends the night with this guy...
Is it Acceptable for my Girlfriend to Stay the Night at a Guy Friend's House?
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