Boyfriend goes on holiday without me

My boyfriend and I have been together for a year now. We have not had any bigger trouble so far but there is something that is bothering me quite a lot. It's the fact that several times a year he goes on short trips abroad with his students association (he is not a student anymore but still sees them frequently). Everybody knows - and he confirmed it when I asked him - that people go on these trips mainly to have sex and drink as much as they can. Not only that - I know that some of his ex girlfriends go on the same trips as him and chances are good that they cross each other's way. I am jealous and he is well aware of that. It annoyes me that he never consults me before booking his trips. He doesn't say something like: "You see, my friends go there and I would really like to join them. Do you mind being alone for a week?" No, he just decides, goes ahead and books it. I think he should be a bit more considerate of me. There are things you can do when you are single but you can't do them the same way when you are in a relationship. These trips seem to be more important than his holidays with me. For example, he knows perfectly well how much I love skiing. I didn't have the chance to go last winter but I would have gone with him if he had been willing to. Instead, he went on a skiing holdiday with his students association. He didn't ask me to come. He didn't ask if I was ok for me to be alone for two and a half weeks. He just went. I am ok with separate holidays, although I think that both parts have to agree in advance. I mean, how many of you girls would be perfectly ok if your guy decided to go to Ibiza with a group of only single men? Or on a booze-and-shag ski trip with former university colleagues and several of his exes wandering around? So, here my questions: Is it tolerable for a woman to see her guy go on these trips? Is he right to keep his independence and liberty and keep going? Thanks for your advice, I really need it!

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