Yes, I am friends with many girls. I just spent way too much time with this girl.
When you said something about moving on and not making the same mistake with the next one, I thought maybe you meant like you've decided you can't be friends with girls period.
But yeah, I would recommend not letting a girl you like romantically put you in the friend zone...but at the same time I know plenty of people who started off as friends and then moved on into a relationship. And that's usually pretty chill, since they were friends first they share common interests and friends and what not...although it is a bitch if they break up and expect their friends in common to take sides...but anyways
I've known a guy who's been in a similar situation for YEARS. He's in love with this girl who considers him a friend, he's told her he loves her, and sometimes she'll drop hints or send signals that she might feel the same way....but they never get together. He just keeps watching her get with other guys, watches them break her heart, and then he's the shoulder to cry on when she needs it.
I'll tell you what I tell him: she's stringing you along because she likes the attention. I'm sure if you started ignoring her, she'd start paying YOU more attention, but it would only be to get you back as her...I dunno, back up? Person who makes her feel good about herself?
Because if she really liked you romantically, she'd have done something about it by now, knowing you feel the same way. And if you ask me, if she really cared about you as a friend, she wouldn't string you along like she's been doing. If she really cared about you as a friend, and didn't have any intention of being more than that, she would TELL you, straight out.
I say forget about her romantically, and start distancing yourself from her friend wise.