So tired of my situation

I’m married. We have 2 boys. I’ve been with my partner for 10 years. Our last 3 years of marriage have been meh to say the least. But this past year leading up to now specifically, all the fun, light, laughter, sex, excitement has diminished. I’ve tried everything to make things better. He has even admitted to the part he plays in everything, but does little to nothing to make things better. I’m in therapy for myself addressing my mental health (work stress mixed with this has me struggling), I’m looking for new hobbies, I’m trying everything to be better so that I can show up how I need to be. We talked about couples therapy, he agrees and then I look for places to try and never get any feed back or reciprocation, so I just stop trying. I miss how we used to be and I think I’m mourning that. I’m actually starting to resent him a little because I bring it up all the time and he says he cares but literally his actions will say he doesn’t. I’ve noticed he’s always so giddy and happy with his coworkers and friends (involves female and male coworkers) when he interacts with them and it pisses me off so much because why tf can’t he give me that same energy like he used to. When I ask him, his response is there’s no stress and he can be himself, like I don’t let him be his self? He always seems miserable and I’m about to be done. It makes me feel so ugly and unworthy 😢