Why do people NOW want to date me?

Before I got a girlfriend nobody online expressed interest in me, and I was actually on a dating site (which is designed for finding people for dates). Now that I have a girlfriend (and deleted or deactivated the dating profile), 3 people have wanted to date me. Two expressed interest, but one wanted money and the other wanted to sext with me if I was a girl, so I don't count them. Yet 3 people asked me to date them. Why did this only happen after I couldn't date them? Granted I wouldn't have dated the guy, but I would have dated either girl if they asked while I was single.

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I should mention, none of them knew me, none had even seen me. They knew my username and my profile picture, that's it.
Why do people NOW want to date me?
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