Why can't I find anyone?

After my girlfriend and I broke up a year ago, I haven't been able to find anyone decent to date. I tried to date two different girls I used to work with, and one became Mormon, and the other moved away.
I've tried dating sites and it feels so one sided, and I can't make any headway. Any girl I've asked out in person has a boyfriend...

What else can I do?
Why can't I find anyone?
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