This could just be temporary, you have a chance of getting things back on track.
He has said he doesn't want to split up so i hope he acts on that. A good sign is that you are still communicating. Don't feel you have to turn cartwheels to keep him interested, or step up your input by unrealistic amounts. It takes two.
From your point of view you are on ML, have reduced financial independence, and temporarily may have lost friends who aren't yet parents. He's still working and when he comes in after a day with adults you're suddenly newer role of being mummy and daddy which is bound to change the way you think about and act towards one another.
as a couple things are nowhere near like they used to be.
he doesn't seem to have any ideas. He doesn't seem to be panicky or petulant, he just doesn't seem that arsed.
A wild guess here but do you mean in terms of physical and emotional intimacy? He talks about not feeling connected any more. It's hard to feel loved and appreciated via playstation or Kindle. A reduced sex life after a baby is very common. If you are shattered or feeling you're not at your best then you don't feel up for it. DP feels rejected, he may not nag for intimacy but he starts to keep a when-we-last-did-it calendar in his head. He might be too nice to moan or nag but he still feels hurt or sad.
I'm sorry if that's not what you meant.
I was just thinking that okay, things aren't like they used to be - yes, a baby does that - so you both might need to compromise. Date nights are great, but sometimes just a quickie burst of affection and physical sign you still fancy each other. Having sex makes us feel sexy - rather than a slow build-up and the old pattern, maybe a seized opportunity while DD is napping or asleep? That might be how things are for a while.