Well, my mother was in the same boat as you. Except my father left her for a man. Despite having a thoughtless father herself (He blamed her), and a church congregation that was not exactly supportive and at the best misguided and had a tendancy to speak before thinking, she stayed the course, trusted God and made it through. Both my brother and I have made it, and frankly because of the situation, I eventually found Christ. That was one of my earthquakes. Of course I was 16 and my brother 12 at the time so things were a little different for her.
Enter for the cliches.....
There is light at the end of the tunnel,
To all things there is a purpose,
The sun reappears at the end of the storm.....
Seriously though, he will end up regretting this decision.
May God be between you and harm in all the dark places you must walk.
If you can still laugh, you'll be alright.