<human>: This may sound really strange but I want to date this girl but I don't. She is a great person, nice, funny and really freaken cute, but we don't have much in common. I think it'd be amazing for us to date, but I fear heartbreak. 

Me and a girl had a odd thing going on where I had a crush on her she had a crush on me and we where best friends. Well she reached a point where she didn't romantically like me anymore so I felt the full heart break. We stayed best friends and we've been best friends for about 4 years now.

 After the sorta heartbreak I've feared it since. And this new girl we will call her kaity for now. We are good friends but I don't want to get stuck in the friend zone. I feel like im slowly running out of time. I do try to flirt on occasions but that's as far as I've gone. Help please.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I like a girl but fear heart break and the friend zone. How do I get over my fear and ask her out?