Almost 3 years out, and our MC thinks it's pretty normal that I don't fully trust my W.
Your H broke years of trust, and he's only been rebuilding it for a year. It just takes longer than that to rebuild lost trust.
The trauma of being betrayed jut takes a lot longer than a year to heal. The rule of thumb here is 2-5 years to R. at a year out from discovery, you're about where most people in R are. Relax about the time recovery takes - you'll get there.
I'm sorry you needed SI, but I'm glad your H turned his life around.