Husband with brain trauma

My husband (65m) and I (55f) have been together 24 years. We have a 15 year old son. I have a 28 year old daughter and he has a 29 year old son. Almost 4 years ago, he suffered a brain abscess which caused some brain trauma, memory loss, personality change, etc. He is lucky to have survived honestly. The last 3 years have been brutal as far as our marriage goes and I am not far from walking out the door. He is for the most part, fully functioning, he can drive and cook, take care of himself, all of these things. He's mean, moody, doesn't do anything. He sits and scrolls on his phone all day and all night. Has put on a whole lot of weight. He plays the victim and will not take accountability for anything or even entertain that what happened to him, happened to us as a family too. I don't think I even love him anymore. We have tried couples therapy a couple of times, but that got us nowhere. He won't do individual therapy. He is on antidepressants. I do go to therapy on my own. He was kind of an asshole before all of this happened, now he's just a bigger one. The kids don't want to deal with him. We live like roommates. We don't really interact, we sometimes chit chat, we don't go anywhere or do anything together. There is no affection and sex, nothing in 3 years. I feel like I have done everything, exhausted all of my resources, cried, begged, pleaded, yelled, threatened and now just shut down. I understand the whole in sickness and in health vow, but damn. I feel like I am just existing and not living and I'm still young and I don't want to just wait to die. I'm pretty just miserable and unhappy. I know this is long and I guess just needed a place to vent, with some hope that maybe someone else could relate. Thanks.