Am I too late...

I'll try to keep this short. I've been in a long distance relationship with someone for two years (we used to work together years ago before he moved away). He has ADHD. Things were great, and as I realise now from reading this forum, I was the centre of his hyper fixation for the first few months. He then gradually toned it down and although we were still super close and he was always incredibly caring etc, he would take a week or so to initiate contact after the first year, he would get very stressed about all the millions of things he had to do just as part of daily living. But when he did initiate, he was always extremely loving.

6 months ago, I began asking him for reassurance on our relationship, and I initiated contact a lot more. This was due to my own mild OCD issues. This stressed him out and he told me so, that he felt like he was being crowded when he already had a lot on his plate. I tried to back down, I left it days without contact to show him that I validated how he felt and to give him space.

But when we did talk, I felt he had started to emotionally detach. He would tell me that things are fine in his head, but i could see that this was where our relationship started to take a tumble. The more he detached, the more I grasped at straws, trying to remind him of what we had, of things he promised or said, etc and it culminated in a big argument last week where he said I was giving him too much stress, he couldn't cope with being reminded of things he had said, or demands for his attention, I was getting on his nerves with my questions seeking reassurance, etc. I apologised to him and tried to explain my feelings of the situation while saying that I appreciated his honesty that I didn't mean to cause so much stress. He didn't reply (kind of expected), and it's been just over a week now.

I've decided to pull back and give him his much needed space. I have been doing a lot of reading about adhd in the mean time and have now opened my eyes to some of the struggles he must be going through and how my communication approach has likely added to these and stressed him out. I deeply regret not looking into this sooner and trying to understand him and his needs.

I have decided to go "no contact" for a month to work on myself, how I can better communicate and validate others feelings. However, I'm also slightly worried that during this period, with his lack of time awareness and distractions, he will forget about me. He has always been there emotionally when I need him the most, apart from currently avoiding my need for reassurance when I feel he distances himself. I want him to know that I am taking his feelings seriously and want to try to make things work between us. I'm just worried that if I initiate contact soon, and explain this to him, he will see this as an attempt to get into another long emotionally charged deep conversation which he finds difficult, and will back off again. Do I wait for him to contact me... and then act like normal? Try to carry on and rebuild our relationship? If I say nothing, will he forget me? Am I too late in validating his feelings? So many questions, I'm just really struggling right now, he is so worth fighting for.