He should also have hope that she can change. Was she always like this, or when did she change? He must have loved her at one time ?
It’s a gamble if going out there again and looking for someone and paying child support will be better.
He should make many learning sedarim and do things to relieve his depression. Depression for him is the worst of this.
Is he happy in general despite this woman?
He should find an excellent therapist with the goal of having her join. He should try to be BeSimcha and sing Zemiros, and make the best possible for the children. Maybe he can take a hobby like a musical instrument or art, this would help his depression.