Hello FoxFire Kinemon: Thank you for bringing your concern here to PC.

Since this is your first post... welcome to Psych Central.
I'm sorry I don't think there is much of anything I can suggest with regard to all of this. From my perspective it is all something your fiancé needs to deal with, perhaps in therapy, & that the two of you may need to work through perhaps in couples counseling. There are so many aspects to the situation you describe, I think it would be difficult to come up with anything in the way of easily implemented suggestions. Hopefully other members, here on PC, may have some suggestions they can offer.
In the meantime, however, here are links to 10 articles, from Psych Central's archives, that (hopefully) may be of some help:
The Challenge of Long-Distance Relationships
Solve These 5 HUGE Long-Distance Relationship Problems, Now!
7 Tips for Long-Distance Couples
Making Relationships Work
The 7 Best Tips for Handling Anger and Resentment in Relationships
https://psychcentral.com/blog/how-to...amily-members/
https://psychcentral.com/lib/what-ar...do-i-get-some/
https://blogs.psychcentral.com/imper...with-kindness/
https://blogs.psychcentral.com/imper...ur-boundaries/
https://psychcentral.com/blog/9-step...n-today/?all=1
I hope you find PC to be of benefit.