Autistic relationships!

Hello, my husband thinks he is autistic. He’s been looking into it and absolutely has autistic traits. We took a few tests together and while mine showed that I was likely not autistic, his consistently showed he is likely autistic. He’s unsure if it’s worth it to get a formal diagnosis but that’s neither here nor there. My question is what can I do to support him?

I really don’t know much about autism. I know he has sensory issues, he fixates a lot on small details and little stuff. He is obsessed with magic the gathering and I already try to not get in the way of that. He has a hard time communicating with me because he feels like he can’t express himself the way he wants to but idk how to help with that! I would love to hear experiences of small or big things you partner has done that helps you manage your symptoms or just makes life easier