And the reason is we are wired to love the smell of those we love.
You have a right to hold each other accountable, to walk it out together until trust is rebuilt.
If things were truly bad in your relationship, to include physical abuse, why did you not consider leaving your husband to get yourself and your child out of that situation? I spend much of my time getting into the nitty-gritty and try to share my findings on this site with the hope of making life a little easier for women that are struggling in their relationships or love life.
Remember trust is earned, not automatically given For women, security in marriage is a big deal.