Hyperfocus

Hi I've been with my boyfriend for 6 months he has ADHD and ive never been happier ive read all the stories how people talk about hyperfocusing in ADHD and realized my partner did and still does sweep me off my feet but with us it works two ways as I no i do the same for him. Upon reading about hyperfocusing i mentioned it to my partner he had no idea about this and was devastated in tears. He keeps saying that his not going to change towards our relationship etc the question i had is if made aware of this at an early stage does that mean he wont change? Or is it something that will happen reguardless? I hope i can get some help im very confused I love him with all my heart I want to spend my life with the him i have now not someone who may become a total stranger.... Please help