Why do so many guys mislead girls?

Anonymous
Don't get me wrong, I know there are still good guys out there, but lately it seems like all I meet is the ones who lie and manipulate to get what they want. Why do they do that?

Example, I recently signed up for a dating site, and within minutes I was talking to a guy, he seemed really sweet, dorky, sarcastic, and had a dirty mind (all things that I love in a guy). We were talking a lot over the next week, just getting to know each other, talking about how a relationship would work between us (went as far as to say he would take my virginity, which I made clear that I wanted to give it to someone serious about me), trying to find a time and place to meet face to face, so pretty good conversation and relationship-oriented conversation. After about a week and a half he tells me he's just interested in a hookup and that I'm not date-able to him. He wouldn't tell me why, just told me that I wasn't girlfriend material to him, which I'm perfectly okay with, but I don't understand why he led me on so much. Do a lot of guys do that? Why do they do that? Can anyone help me to understand this?
Why do so many guys mislead girls?
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