I enjoy learning from posts like this because it can help identify patterns I might not have otherwise noticed. From there I can do something.

Something I do periodically is scroll my iMessages and see if there are conversations that have been dormant longer than I’d like. If so, I try to think of something to resurrect the thread.

It should be noted that this is just a term one guy made up, and isn't medically accepted as an ADHD symptom.

Of course it is a legitimate thing that happens to people.

There's my partner. Heck, now I'm almost full!

RSD can't be solved 100%. At best, you can give yourself some guidance on how to resume contact with someone:

1) When was the last time I was in touch with this person?

2) How would I rate my relationship with them on a scale of 1-10 -- this is important because in adulthood friendships can fade even if nobody did anything wrong

3) Why do I feel they would not want to hear from me?

4) List 3 light topics of conversation that are low-risk, and choose one to reach out with. That can help reduce the internal resistance, which is a key factor in RSD.

I know if I "just replied quickly" to all of my personal text in a day I would almost never get any work done, and my circle of friends/family isn't even particularly large.

But yeah... once the initial chance to reply passes it quickly turns into anxiety/dread/avoidance. ADHD is a tough one to rangle, especially unmedicated.

However because I have a lot of 2nd and 3rd level relationships to keep in contact with (for business) the stress can accumulate. My technical solution was to create my own CRM (https://humancrm.io) that is entirely oriented around follow ups with important people. It helps me quickly process follow ups and remove the analysis paralysis.

I also am told all the time "Thanks for following up, I am so bad at it" - so I've just accepted that a lot of people feel the same way and I'm going to have to make the first move.