>>/27269/
> who know exactly how to protect, nurture and fix her
How? As things stand, I belive that she can't be fixed and that she is far too broken to have any kind of functional life. Even DBT therapy wouldn't work at this point.
Also, how would you prevent her from cheating? You can't watch over her 24/7 since you have to work and she is BPD, so she needs attention ALL DAY EVERY DAY. She will naturally try to find attention from other men when you are not around. Locking her up in the basement with no internet access is the only way I can think of you could stop her from cucking you. But she would start self harming and eventually an hero'ing out of boredom if you actually did that.