There is never an excuse for cheating.....I was married for 33 years to a guy who I ended up realizing that he has serious issues that made staying married to him totally impossible......but I didn't leave for another person....I left because I knew that in our older age, he wouldn't be any more capable of taking care of me or the finances than he was when I needed him to take care of everything when my depression hit after loosing my engineering career.

There is NO EXCUSE for having an affair......& you are definitely better off without her.

Yes, having mental health issues can make a marriage difficult to deal with....& in the future, you can use this experience to show your way to the possibility of someone else in your life.....but make sure that they are able to deal with the mental health issues before ever making anything into a permanent relationship....but you deserve to find someone who can make you happy....but it's important to learn to be happy completely with yourself.....& always be there for your daughter even with divorce separating the family.....being there for her & being a good dad example is the most important thing for you to focus on & get a good lawyer to make sure that your rights aren't twisted around by her if she gets a lawyer.....but most divorces these days are considered NO FAULT.....so they can't use things against the other person.......

Wishing you the best going through this & staying strong for you & your daughter