We have had many talks and he isn't changing what is bothering me. I just don't want to make the wrong decision and regret later.
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What is bothering you?
The honeymoon phase does end, just ensure that what you are feeling, that lost of spark, isn't just the honeymoon phase ending. Hm, as for if you were to be jealous of him eventually finding someone else, not necessarily. Right, a child can have his favorite toy, and then his birthday comes around and he has a new favorite toy, but try to take his old toy (that he doesn't even play with) away from him or make him share it, and the child would be upset and say no, it's mine. It's possible that's what you are feeling, you feel possessive, he is your's, your fiance, so you get jealous at the idea of him with someone else.
I think what you should think about are the things that bother you, if they are serious concerns and he isn't changing, then you should definitely reconsider marrying him. Are those concerns deal breakers.