You'll find someone when you aren't looking. Don't stress about it, just work on making yourself happy and do good things for youself. Surround yourself with good people, they sometimes tend to have good people single friends.
As for that other girl, hmm. Not sure. Maybe she wasn't that into you or maybe you shouldn't have told her you want to take it slowly. No need to disclose too much info right off the bat. Either way, she wasn't the right girl for you.
So, so you think you can tell Heaven from Hell,
blue skies from pain.
Can you tell a green field from a cold steel rail?
A smile from a veil?
Do you think you can tell?
And did they get you to trade your heroes for ghosts?
Hot ashes for trees?
Hot air for a cool breeze?
Cold comfort for change?
And did you exchange a walk on part in the war for a lead role in a cage?