I'm sorry you're going through that. Be open to how he feels and let the communication happen freely. It's hard not to take other people's actions/moods towards you personally. My mom would become very mean and depressed and manic and abusive and we always believed she had a mental issue but she refused to go to the doctor, and whenever she was acting that way, we couldn't NOT take it personally. So just be aware of that, it's very hard to not take something personally in that context.

He needs to understand you. But you also need to understand him. It's a two way street, as is any relationship.