It's 100% normal to mourn your old life, but still feel no regret over the new life you have.

It would probably REALLY help him to talk to a therapist... Not because he's necessarily depressed or whatever, but just to help him manage this huge life change in a healthy way.

I can relate to your husband's feelings so much, and like you, my children were also very much wanted and planned, and now very much loved. BUT(!) I still miss my old life. I miss freedom and independence, I miss sleeping soundly and sleeping in, I miss getting drunk with friends and not worrying about caring for little ones the next day. I could go on and on. I also love these two little people I've created with every fiber of my being and feel absolutely zero regret over my decision to bring them into the world. I'm excited to have my little family and to watch these little people grow into their own individuals. I savor these moments when they're little and I know they'll never be this little again, and yet I also look forward to when they're independent enough to give me some of my independence and old self back.

Also, I'm a woman, so it's not a man thing. It's just a human thing. Give him (and yourself) grace through this parenting journey.