Hello Soso
I agree that you need to sort this out now. The most important facets of a relationship, in my opinion, are love and trust. You need both, I think. You have the love, but not the trust.
This is probably because of what has gone before, as you say ~ various things.
This needs to be talked out fully, I think ~ perhaps with a good, reliable relationships counselor. Would that be possible?
After all, you are engaged to be married and marriage should be forever and should begin with complete trust.
As for the sisters and the ex, I appreciate that this is very difficult, and not very helpful or supportive, but they are entitled to be friends, if they so choose.
It is your relationship with your fiance that you need to concentrate on.
Good luck!
