For girllss only please!!!?

Well I'm a 16 year old boy so this is about relationship problems and well who else to get help from but girls right? Well let me get straight into it. I was in love with this girl (lets call her X) and she fancied me and I fancied her back and we became gf and bf. Thing is during our relationship I messed up alot and we would break up and then threaten to delete each other (which we neva did). Then we wud get bak together. However, the last time this happened (we were about to make up), I really got her angry and she told me she hated me and actually DELETED me. She didn't talk to me for months, and recently we saw each other at a party. The thing is I'm desperately in love with her and I don't want her to go out with other people (shes very very beautiful) but she didn't really talk to me. How can I get her back without sounding desperate/needy? This girl is my all, I don't know what I'd do without her. Thankyou in advance.