I read your post twice.. I have to say I see nothing that is "bipolar-ish"

People can flip moods just because they can.. it doesn't mean there is any mental illness to blame for it. Some people are flaky and change there mind like I change my nail polish.

If your calling it Bipolar will help you tie up the loose ends in your mind about your relationship with him and be able to move on , then by all means do so.

If nothing else you have learned a lesson from this.. Don't tie yourself financially to anyone so soon in a relationship. Maybe taking him to court will help you move forward.

Welcome to PC