I think that you should really pray about it and ask God for peace of mind. I bet there are lots of different kinds of thoughts floating in your head because marriage is supposed to be forever. If you see that things in your relationship are not where you would like them to be, then you need to have a serious open conversation with your fiance and try to explain what makes you doubt his love and affection for you.
Always remember, if there's something wrong and you don't address it, ultimately it will cause your relationship to fail.
Always remember, if there's something wrong and you don't address it, ultimately it will cause your relationship to fail.