My then-boyfriend, now husband, has told me that the first time he met me, he thought: "THIS is the one. I want her". It'll be 19 years next month.  Of course, if you don't feel the same, you don't. But some people have the insight to recognize a good human being just watching their faces and having a short conversation (sometimes they don't even need the conversation). Maybe they are not desperate, maybe they just find you worthy.