I have gone through literally this exact same scenario. I'll send my partner texts during the day and they'll ignore them even through their lunch/breaks, or skim them and miss something important. I get to the point sometimes where I have to stop texting them, even about unrelated topics or important updates, because I know the number of texts will build up too much and when they see it they won't read any of them. As is common, my partner is dependent on me. I am her rock and the breadwinner for our family. She doesn't provide enough emotional support, I have to constantly hold back my emotional needs. Maybe she is emotionally underdeveloped. Like hell, I have to remind her to say caring things to me, and even then sometimes they don't know what to say even with a prompt. I'm curious how many of these other things you relate to or you have in common with me.

I'm also curious, does your partner have ADHD?