Break ups and divorce aren't easy. When others aren't honest with themselves, they simplify their reasons and just cut ties, completely. Although your bipolar disorder is a new diagnosis, it didn't just come about overnight and create a new person within you. Stands to reason that it existed a long, long time.
He relocated with his employer, moved you from your social network then kicked you out without any financial/alimony assistance?
Here's your opportunity to step back and reevaluate what you want from life. Your post mentioned moving back to where you were. That's a goal worthy of taking all that dwelling on him energy and opening yourself to focus on your goal.