The problem is the weekend with the men. No one that I know would be ok with this. Well maybe the couple that play around might, but they always do things together, so they might not be ok going solo.
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It is respecting the one you are with. Op's GF has already gone other places with out him and he was fine with it. He is just not ok with her spending a weekend with two guys she nor he knows.
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Wookin, unless you are in a traditional relationship where it's agreed that the man is the boss, DO NOT have the right to forbid a partner from doing anything. She is your partner, not your child.
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