Advice?

What do you do when you're not emotionally invested anymore?

I just had my second anniversary with my husband. But.. I'm so tired of being his "parent." He doesn't clean up after himself. He leaves stuff everywhere. He hibernates in the bedroom, away from me and the kids. Whenever he is out in the living room he's always on his phone. He spends no time with the kids, and when he does all he does is yell at my son. He informed me the other day that he has no problem being the mean parent, which I have HUGE issues with only because my son begs him for attention and he ignores him or is mad at him. Our daughter, doesn't like him because he has nothing to do with her either. I can't leave her with him at all because all she will do is scream and he's immediately angry and calls me back to get her. I can hop in the shower whenever she's asleep, but if she wakes up and cries he brings her to me, sets her on the floor and leaves, so I don't get to shower on a regular basis. He's never helped with bottle feeds, or diaper changes. She was hospitalized a few months back and we didn't see him at all while we were there. My parents had to keep my son, and pick us up from the hospital. We go months without sex, which was never THAT big of a deal, because he's never been that sexual, but the last time we had sex was 2 months ago. I only know this because I'm 8weeks pregnant.

When I found out I was pregnant he was pissed. Informed me he didn't know who I had been fucking, because the babe isn't his. You guys.. Ive only been with 2 Guys my entire life. My first husband, who I have my son by. And him. There's more going on. I'm just honestly tired of doing this with him. I'm about to have 3 kids.. I don't have time to 'raise' 4.