I Want to Get Married

So I want to get married some day... and I have been making a conscious effort to get out and expand my network of friends. I was out with someone yesterday and she brought up wanting to get married and hoped things could work out between us. It triggered the biggest fight or flight response in my mind. I guess I should say I went into it as lunch with a new friend... not as a date, I guess she thought it was more but nonetheless... is it that it was brought up on the first time in a face to face meeting? Is it just the typical guy response? Why did the mere mention of marriage strike such a fear in me... I want to get married someday... I don't get it, maybe I just don't want to be rushed into it. At the time I let it roll off and then she sent me a text later and brought it up again...