~MYLIFENOW~
It does sound like BP. I am diagnosed bipolar 1, and have had a few full blown manias in which I destroyed trusts people had in me and a couple long term relationships. Depakote is a well known drug used to treat BP. I feel very sorry for the people who deal with bipolar folks. It must take alot of tolerance and love to deasl with it. I hope you find your answers and can successfully get on with your life. I wouldn't be surprised one bit if he came back in a few days acting as if nothing ever went wrong, but if you choose to stay with him, be aware that this is typical behaviour and will last his lifetime. Good Luck!