You might not like this, but I am very relieved for you that you haven't conceived yet (with this man). The incident you dearibe above was sexual abuse. It doesn't matter how horny someone is, a normal, decent person does not even conceptualise of behaving that way, much less actually do it. Walking around with an erection whining and demanding? Not jut threatening but pathetic. That is a man not fit to be a father... not even fit to be someone's partner, frankly. It'd be disgusting and unacceptable behaviour for a 14 yr old boy!
You say you had sex willingly, but you basically had to frame it hat way in your mind, because he created a situation that was unbearable untilyou gave into him. Abusive, abusive, abusive. Anger management has a very low success rate for abusive men and a high rate of recidivism.
You often feel used by him in sexual situations. He is having anger management. And you don't feel like you love him properly any more. Well, of course you don't, he's abused you and treated you shittily. That's your gut speaking. That's your true self telling you that this man is no good for you. This relationship is already so bad, and it will only get worse. Men like him don't change for the better, they just change the way they do things to make it even harder to get out.
You might want to love him, and want to be in a relationship, but it looks terrible. Being single has to be better than this. And it would be better to never have a child than to force them to grow up with a father like this. Seriously. There is no glory in hanging onto a relationship no matter what.