I once said to my husband would you do this if we just met? (because he was being a bit too overly familiar). We have a lot of guys in the house with my sons and it was just too much. He got the point. I think there has to be some attempt to keep things as it was when you first were 'courting' otherwise, the attraction kind of goes. Half the reason we're attracted to people is because they care about themselves. We like people who are confident. Or I know that's why I was attracted to my husband.
If you could word it that way to your husband, I wonder if it would sink in.
My husband has had depression and when he has, it was kind of what you describe. He retreated into his own little space, and we saw very little of him. He also didn't do a whole lot around the house, and was tired/lethargic. I was more active, and I think women hit a point where they are aware if they don't try, it's all going to go downhill from here on out ... whereas men go through a phase where they think they can still eat/behave as they did as teenagers ...
and then they hit this funk where it bugs them but they don't do anything about it. Or some do.
And then they are depressed because we aren't that into them. (For me it was menopause and of course having kids). So maybe you've hit that point.
I think being encouraging and supportive is the way to go. My husband found an activity he enjoyed, and from there, found another, and I just supported him and he also talked to his doctor and got help for his depression. It made the world of difference.
Just a thought. You could always schedule a date night to go see movie, or our for dinner. I like going out with couple friends. It keeps things light and fun. You see them for who they are, not just your hubby and dad to your kids. Puts them in a different light. Fun.
If he gets active, and the endorphins kick in, he should feel better. Can you go for walks even on weekends? take kids for bike rides?
Smoke - I agree - he'd have to shower. I would just say, it's the smoke that bothers me (try not to say you smell, but the cigar smoke smells - it bothers me). I hear you.
ETA -
I love Elayne's "Some how you both became parents and domestic coworkers ,but no longer a couple. The couple is what fuels the family."
And I do agree, counseling for you to gain perspective.
If he's a jerk - that's one thing. If it's his health, and you're just in blame mode, and you're not giving him anything either (except being a mom and running house) - that's another. It takes two. You need to figure out if you want things to change, or just walk away. This limbo situation is not good for kids - or either of you.
You need to decide. You can do that in counseling. He needs a check up.
JC - "I think you should start dating him again. Get tickets to musicals concerts or whatever your thing is. Go out with other couples." - great advice. You see your spouse as a person - which is attractive. Don't talk about stuff around the house/kids/problems. Got out and enjoy yourselves - or go do something new (try a new activity). My husband and I go for a walk every time it's nice and we have spare time, to get out in nature. It does not have to cost a lot. Go grab a bowl of chowder (or whatever he/you like - switch it up). Go for dessert. Do it when your kids are occupied or at friends if you don't want a sitter. Just make it happen. Try that, and if all else fails - then think about a separation. Don't throw in towel until you've tried. If you really have no interest in trying - then ... that's different.