You would have to decide to trust - to a degree. I don't know if you can ever trust completely again, but maybe that's a good thing - it keeps you aware of what's going on in the M. Neglect and taking your spouse for granted contributes to the breakdown to begin with.
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17