I don't know what to do

SO my Fiancé and I have been together 2 and half years, we have a long distance relationship as of now. lately he hasn't been dealing with it very well, and he found someone in person. now he doesn't per say want to be with them over me, but he wants to have a relationship with them (this including sex) for the rest of our time being apart. as more of a human experience, he's a very open person and we've talked before about having other people in the relationship. But i'm not sure i can handle this, we love each other very much and plan to get married in the future. but i don't know if i can handle him being with someone else like that. Any advice on the matter? it'd really help

I know what he is suggesting is a little bit hard to chew and it seems like it could be wrong and it's not the traditional way of being in a relationship, but don't let those things cloud your judgement on this. There is no right or wrong answer you just need to make sure that you are honest with yourself through out this whole thing. I have a friend that actually did this. Off to college, boyfriend back home. They agreed on open relationship but they were each others main. It was a little rough at first but after learning and handling it maturely, they learned to trust each other and it would out great for them. Now I think there are some things to keep in mind to though, this isn't the answer for everyone. This is where you really got to be honest with yourself. For example, what does sex mean to you? If you it is something special and intimate for you, its a symbol of intimacy with you and another person. This probably is not a good idea then, you will only ever few it is him have this special encounter with someone else and it will always hurt. If you do put sex on this pedestal, it is this activity you do between two people. Its special if there person is special but you understand casual sex and meaningless sex, I think at this rate you could learn to be at peace with it after you establish that trust. Be honest with yourself and him and keep and open mind and I feel like you will be okay.