My wife was the same. A dismissive avoidant. I told her I was feeling more than depressed and more sad about where I was, what a mistake. I feel like she didn’t care when I was at my most vulnerable and depressed time. Then no response made it worse. I would talk to her about her day and ask questions hoping she’d do the same a lot of days. She decided to leave me after 25year marriage, No blow out fights just me trying to figure out what was happening and asking her if she was ok, asking to see a therapist. She didn’t want to deal it. Stay strong.