Can’t adjust

Hi mommas! I was wondering how you were able to help your partner adjust to a second baby? My husband has been having a horrible time adjusting to our newborn, he’s been such an amazing help with our 18 month old. But he can’t/won’t help with our newborn. He keeps comparing the two of them because they’re vastly different our first son slept all the time, wasn’t breastfed, and didn’t mind if he wasn’t held whereas our newborn is wide awake a lot of the time, is breastfed and would prefer that you’re holding him while you just walk around. I’m going insane because sometimes I just need a solid 2 minutes to myself to poo (I’m an anxious pooper I know I know TMI. But whenever I hear my newborn crying I want to run to him that second) but by the time I get to him my husband just says “He’s broken” or “he hates me” idk maybe I’m going crazy, but I wish he could be able to watch both kids so I’m not struggling trying to accommodate him but in the morning I’m struggling with a newborn and a very hyperactive 18 month old. I feel so overwhelmed and unsupported but I know he’s trying. But I can’t help but resent him a little