Should you question your future with someone over details?

I love my guy. We have been together a year, and it is still a learning process for both of us. We are pretty different, but we still make a great couple and have a lot of fun. We both are looking at the future and have a few differences. I know I want children someday (prolly not for a long time, but it’s on the table) whereas he isn’t sure he will ever want kids, but it isn’t set in stone. I want marriage, he just wants to be together forever…marriage itself isn’t necessary for him. Thoughts? I feel like he is the “one”, but don’t want to overlook details that might be big down the road…..