Speaking of dogs - do you know those folks who keep really viscious, angry dogs in their homes? They bark like crazy, and nearly bite the hands off strangers? They are dangerous, terrible creatures...but the owner always says "Ohhh, he's just a sweetheart"...The owner remembers those dogs when they were puppies. When they were well behaved. They remember that ONE TIME at the park when the dog actually stayed on the leash.
You remember those good days when your boyfriend was still a good guy. Today, he sounds like a complete mess. Take off the blinders and get RID OF THIS GUY. This is way worse than having a nasty old dog around - this is a human being and he can severely screw up your life. Run like the wind and don't look back. Easier said than done, I know...but if you stay with him, things will not get better.