Why not move out ? You could at least go to couples counseling and see over time if he truly has changed ??

I am NOT one who believes ALL narcissist are unable to have a relationship that can work well. Just as there is spectrum of any mental illness or personality disorder. There are always people who can make it work.

Yes all couples have up and downs. He’s never been abusive mental , emotional or physical from what you have shared.

Yes him taking to another women was wrong wrong wrong, that is unacceptable, but again I am NOT someone who would say it’s impossible to forgive some one for talking to another woman, full out cheating ?? My husband cheated that’s a line I couldn’t forgive. if he felt depressed then he should have sought help, well ...I feel some people truly don’t realize what they have until it’s no longer there.

He will need to prove overtime , long time that he truly is committed to making changes.

It’s good he is not only supporting his children but going above and beyond what the court orders are , so many people ( men and women) who won’t pay a single time more. My ex always helped with my daughter needing extra, she was in marching band , holy hell its expensive so he helped pay for half or more of those expensive and was happy too.

If you love him and want to give it another shot ? Then do so... I think right now since you do still love him if you don’t you will have to deal with the “ What ifs?” For a long possibly life time of thoughts.