Is it ok to not believe in words anymore?

It got to the point that I've turned down someone that said ''I want kids one day''.

This was my reply: ''That's what they all say, famous catchphrase to get a girlfriend''.

There is a chance it could've been indeed a real serious man but my mind has flashbacks every single time I heard those words (same thing if I heard the words ''I promise'') or similar phrases. Is it ok to not believe in a single word anymore?

Updates
+1 y
I don't even know who is for real anymore so I'm just assuming it's a liar if I hear those words early on.
Is it ok to not believe in words anymore?
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