Married but feel single

I have a 6 week old and although she's my fourth baby, it's my husband's first. We planned and tried so hard to have this baby and it was truly a miracle I got pregnant and delivered no (major) problem. I had a horrible marriage with my ex where he was no help and extremely abusive so I really didn't want another baby, EVER. But my now husband is such an amazing person so when he wanted a baby (2 actually) I thought it'd be different

The whole pregnancy I was fed the line of "we're having a family and it's with me, you'll see how different and great it is". It's now 6,almost 7 weeks post partum and I'm realizing it's not. I have changed every single diaper, I have given every single bottle, I have been alone every single night with the baby. I feel so friggen alone. I'm so upset at myself for believing him. I keep thinking what did I get myself into. And now he's asking when I want the next baby. I get he works and need his sleep for work and I'm off for a year. But part of me just wants to walk away one day and leave him to figure out the whole baby thing for himself (the other party of me wouldn't want to do that to the baby). Not sure if it's deprivation of sleep but I'm almost hating him. Anybody else feel single when married or hating their spouse? Not sure if I'm tired or depressed. Urghhhh babies are so hard on relationships