You just need to talk to her. Tell her you trust her but you are uneasy about her being at a seaside villa with two guys. Doesn't hurt you to be honest and I think that she would appreciate you being open and honest about it as well.
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But, bottling it up is only going t cause problems for you down the road. This might spill out later and get ugly. Just talk to her, find out what assurances she can give you to put you at ease about this.
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More to that... You have the right to feel bad about your gf sleeping in a villa in Italy with 2 guys, including all the intimate atmosphere that comes with it. It doesn't mean that you're accusing her for possible cheating. It just means you're not approved with what you know she's planning.
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She must know about it verbally. Say it clearly. If she loves you, she can make some efforts, to meet you half way, so she can have all the fun, while keeping you calm and secure, by changing some sleeping arrangements.
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Think about it.. How can she have fun there, while knowing that the man she loves feel stressed and has a really bad time? It doesn't make sense.
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