Hi,
Well I think you should just let your dad meet your fiancée. I know how dad’s can be protective of their little girl trust me I know all too well. But if you love him I’m sure he must be a nice guy. I know your dad will warm up to him eventually. And as for your friend, I know feelings of old relationships are hard to really get over but, invite them to hang out with you and your fiancée as well maybe plan a day out together or something. Who knows you all might turn out to be great friends. Good luck!