ADHD is not an excuse to be a D*ck. I’ve been in his mood before, where you just want to be alone and end up pushing loved ones away. Having space is okay, but to completely neglect someone who loves you is not. You need to bring this up to him, explain that you understand that he doesn’t feel okay at times, and sometimes he needs his space, BUT you have needs too. You’re putting in a lot of effort to understand and work with his disorder, he needs to do his part as well.