Tbh exact same here. The resentment, the 'no fun anymore' comments, the lack of empathy. Ds was just coming up on a year when I found out there was another woman. I snooped on his phone looking to reassure myself because I knew something was off with him but I thought I was just being paranoid.
I think, anyone sensible knows that when you have kids life takes on a different intensity than before, and even if you didn't expect it, it's generally quite easy to figure out that's what's happening. It sounds op like you're stuck with a lot of the dredgery with the workload balance. Obviously, noone is saying that your child is a chore - but it can be both wonderful and highly draining looking after a toddler . And the bulk of your work is keeping your household running which isn't sociable and is very repetitive. Being in work is by nature sociable, mentally stimulating, and can be more varied. So I know I quickly started to feel a bit more 'boring' when I was in the house most days and doing all the household stuff compared to how I felt when I was out at work. Because when you're at home you're in mum mode, when you're at work you're still yourself if that makes sense. The split in that respect is uneven.
Do you have hobbies? How often do you get to go and see your friends and be YOU outside of mum/wife and do the things you find fun?
I think he needs to man up here. The early years are tough and you need to be in the trenches together. I think you need to have a further conversation to establish exactly which of his needs he feels isn't being fulfilled right now and what in capacity. I think he also needs to explain what he thinks would address the issue in a way that will work for both of you. And I'd encourage you to use the opportunity to think about how well your needs are being met by him right now. Because it sounds like he's falling short in quite a few ways.
Coming to you and saying you're not as fun is actuallt very unfair. Coming to you and saying x I'm worried about your wellbeing/stress levels or saying x I think we need to have more time together and as individuals so let's plan babysitting and how we can use it or just doing something romantic and investing in his wife would all be supportive, empathetic ways to deal with the same issue. What he's done, is make it your issue to sort out without taking any responsibility as the other half of the team@.