Bipolar or just psycho?

There was another episode 3 days ago, where "the monster" after I ask him to get the kids medical insurance proceeds to tell me it's not his responsibility to get the kids insurance, and why can't I do it?  Then begins his verbal tirade on how in his words, I am a "financial parasite", "useless", "stupid", and he's not responsible for me.  There's more insulting and abusive language, but it's late and I'm too tired to type it all. Anyway, the next day wakes up, and decides he wants to take the kids and I out to buy shoes. Or course, I refuse to go. The next day he suggests we all travel and take a short cruise down to Mexico. I'm like um ok? WTF?!!! Though it would be nice to vacation with my kids. I don't feel like being cussed out, yelled at nor humiliated in public. I don't want an altercation. To ensue leaving me without an escape while on vacation. He's never sorry for being a prick. He's never remorseful. He's either bipolar, or schizo either way. I'm not being stuck in a box with that son of a bitch for any reason. I wish he could get psychiatric help. He's freaking nuts. According to the urban dictionary bipolar disorder describes a person who has frequent mood swings triggered by something minute. It has drastic impact on their lives, and on the lives of those around them. I really believe something is truly wrong with him. I can't say for certain he's bipolar but something is wrong.