I've heard of this happening before. Things seem to be going well, then the couple moves in together or gets married and suddenly someone finds themselves stuck with a Mr. Hyde. It's unfortunate and it's unfair. However, in this case I have to second what everyone else has been saying. Things will get worse and you could end up in very real danger if you stay with this man. Get out fast before he does you permanent psychological, physical, and/or emotional damage. The longer you stay, the worse it will get, but the harder it may be to leave. Don't let yourself become trapped in an abusive situation. Go and don't look back.