Understanding ADHD in Relationships: How to Explain to a Friend

Me, my female friend, and my male 'friend' all have ADHD, but we have different symptoms. My male friend (who I'm trying to date and who is romantically interested in me as well) doesn't text first most of the time. I asked him why, and he said with his ADHD, people tend to be "out of sight out of mind," and it doesn't mean he doesn't care about me. However, my other friend said if he really cared, he'd set a reminder about it or something like that to remember and he'd text first bc she's never had that issue with someone she loves before bc of her ADHD. However, I myself know I have people I care about that I forget to text, even with reminders set,,, plus I honestly don't mind texting first since he almost always responds quickly and with enthusiasm, making it clear he wants to talk to me. Plus, he always invites me to hangout in-person, whereas I'm bad at remembering to make plans, so I feel like we go good together when it comes to that. So how do I explain to my female friend that him not texting first is part of his ADHD and he's not being a jerk? I've tried explaining it, but she's also neurodivergent and she has a hard time understanding situations she's never been in. I really want her to approve of him as my potential partner though since she's my roommate and one of my closest friends and we'll be living together for the foreseeable future.