WW,
If you are doubting that you will stay with him, then why are you staying in the relationship? I don't mena to sound flip, but if you are planning to leave, waht is stopping you right now?
My ex was very sweet, but had firearms and as his alcoholism progressed, he began shooting guns off in his house. Violence was never in his nature, but during the last year, he began verbal abuse towards me that made me realize as his behavior worstened and we broke up, that he had been escalating slowly for years.
Please watch yourself before you allow behavior that you say "normal" people would not allow.