@Juicy How you doing luv?
Listen...
If you have reasons to be doubtful then
explore them. If you're not sure about something then keep it simple, make a pros and cons list. Doesn't take much work or time, so just sit down and try to list it out the reasons for your nerves.
If you find there are no reasons to doubt, then you must learn to let go of the idea that you can save yourself from a pain you can't know whether it will come or not. Baby everybody wants TO NOT BE cheated on, or to get an STD. However, every relationship is part gamble ma. Much like living actually, I mean, how do you know you're not gonna die tomorrow and leave your fiancé's emotions in shambles? That's something you just can't know.
My point is, there's always ways to infer and deduct things (like through a pros and cons list), but nobody actually really
knows the future. So until shyt happens you gotta learn to not let your worries get you nervous, just like I'm sure you're not nervously worried about dying tomorrow either.
Above all luv, learn to accept that which you have no control over. By that I mean, knowing that you can't control certain things should mean that you don't have to worry too much about them.
That's why faith (and I ain't just talking about God here) is so important to most people on earth, because we realize we can't know everything and so we leave some things to chance just so we can be at peace. That's maturity.
I hope you have a happy marriage my lil' black goddess.