Bipolar 11 I need help understanding

My husband has just been diagnosed with bipolar level two. He has been misdiagnosed for two years with anxiety and depression and no medication has been working and we now know why.
now that we know he has bipolar two, his behaviour makes so much sense to us. But in his manic phase, he left the family home. This was one year ago, and he still says that he is unable to come home because it is too much for him. He has not yet been medicated, as we are Going to see a psychiatrist in a weeks time. I'm just wondering how much of his behaviour do I excuse? Are his decisions conscious ones, or is everything in him mind clouded by this mental illness? Im just trying to understand what's real and what's not and what I excuse and what not to.
Will much change when he’s medicated??
This is very confusing any help would be appreciated thank you