Prospective ADHD marriage

I am not married... yet.. but I know my bf who has ADHD plans to ask me to marry him in the coming week and I love him without a doubt and known him for over 5 years, but I am worried about being able to continue handling his ADHD when it has already caused issues, it started out so wonderful he was as i've seen it referred to as "hyperfocused" on me, but now that I have been living with him it is like the newness wore off and I find it harder and harder to get his attention from his computer and phone onto me.  It is so frustrating and I find myself wondering if he still loves me just as much and I try to see the good things he does, but it tends to be hard, what can I do to keep myself in perspective and prepare for a lifetime dealing with his ADHD?