It's not just the guys, it's also the girls. Some people are
being fake just to grab the attention of others, they want people
to like them. So they lie about their background and other
stuff. Girls and guys are almost alike, plenty of fakers
worldwide.
Next time you meet someone you like, try testing
them. That's how I go with girlfriends, don't upset them, ask
normal questions. If they keep giving you negative answers, keep
asking more. But if they keep answering right answers, then
yeah maybe he/she is trully him/herself.