You were a cheater. You don’t get a clean slate once the cheating stops. You not have to rebuild up all that trust you had, and even more so because she has REAL reason to doubt you.
You have shown her that she can not trust you, don’t put the blame on her for a normal reaction to your awful/immature/selfish behavior
Getting cut with blades during sex is pretty far out, that's more than a kink
It’s not insecurity, it’s intelligence.
You were a cheater. You don’t get a clean slate once the cheating stops. You not have to rebuild up all that trust you had, and even more so because she has REAL reason to doubt you.
You have shown her that she can not trust you, don’t put the blame on her for a normal reaction to your awful/immature/selfish behavior