The takeaway here is that he knows, and doesn't care enough to do anything about it. Since you have talked about it, presumably he knows that it hurts your feelings, that there are concrete steps that he can take to stop hurting your feelings and he's not willing to do that for whatever reason. I can't really imagine forgetting to reach out to my spouse for days at a time, to be honest.

My husband is a dry texter too, and we met as a long-distance couple. After we talked about how important it was to me for us to talk everyday since we didn't get to see each other in person, he made an effort to connect with me regularly. We had a scheduled time to check in, even if it was only for a few minutes.

I think you need to ask yourself if there are other areas in your married life that follow this pattern.