I read research that women are more likely to initiate break up and divorce. And actually my own experience and most people I know it’s the case. Some (not all of course) men don’t like to end relationships but they create situations when women have no option but leave.

One method is to give ultimatum: you do XYZ (something man knows she wouldn’t do) or we have to break up, so women usually leave.

Second method is to make relationship so stressful that woman gets literally sick mentally and physically so it gets unbearable so she ends up leaving.

It sounds that this guy uses both methods and in fact he already says he wants to break up. I think holding on to him is not wise at this point. It’s only going to get worse

I also have to say that people don’t suffer and feel sick throwing up in a happy relationship. Feeling sick is usually a sign.