Whatever it is, it isn't your fault........I wouldn't leave the house. Obviously he isn't telling you the truth (or is afraid to)...another woman? Mental health issue? He definitely needs help and you need to stop moving around and stay in the house.

He buys a boat without any discussion? Something is very wrong, and unless he gets help....the odd behavior will continue.

My suggestion is to get help for YOURSELF to help you deal with this.