Upset.

I've been living with my SO for a short time now. I moved from Kentucky all the way to Texas to be with him. And tonight i was telling him of a talk I had with his mom on the phone. She made a statement that started off "if yall get married and have kids.." And I told him about it. And he responded with "I'm not ever getting married. I can't believe she said that. Why would she say that? And to be quite honest? I didn't even read into what she said. Yes, I love him. But I do want to get married eventually... What should I do? Does marriage even really matter? Am I overreacting? Should I stop thinking about it because his mind could change with time? He's never even told me he loves me. And now I'm thinking he never will.