What should I do about him?

Wow - So because his little brother died you’re practically saying it’s okay that he abused you? Seriously think about what you’re saying. Obviously things are going to be hard for him because his brother died, but he did you wrong, really wrong and you should leave him. There is no excuse why a guy should ever lay a hand on you, ever, and I think it’s crazy you’re still with him. He even tried poisoning you, like is this not a flashing red light that you need to get away from this guy? He has no respect for you, at all, and by you letting him do this you’re proving that you have respect for yourself either. You need to get your priorities straight and realize this guy is just out to get you, you need to stop all communication with him and just move on with your life. Everytime you start to miss him remember the bad things he’s done to you, you could have died several times due to his actions.

Guys like this do-not improve although you keep hoping he’ll change, I can guarantee he wont. It goes from verbal, to physical, to sexual, do you want that? I sure hope you don’t. Staying with him is digging your own grave and you’ll wish you had of left but it will be too late if you don’t do it A.S.A.P.