Anony..relationships can certainly be difficult, ADHD or not.
You mention that you were concerned about not being a priority in his life,
and then you two didn’t speak for a few days. Could be during that time
he was thinking that you were correct, and rather than you having to deal
with it all, he decided to end the relationship.
No one knows what will come in the future, but considering that was two
months ago, my suggestion would be to go ahead and move on with your life.
Now, that’s just my opinion, but if you were asking me for advice, that’s
what I would tell you.