I dont know what to do!! please help?

Ok well... me and my boyfriend colton, have been dating for about 2 and a half years and at the very start of our relationship this girl, meagan kept flirting with him she even told him that she loved him. then she started telling him stuff about me that wasnt true in any way! like that im fake and stuck up and on and on... she almost made me lose the only thing left to live for. so i txt her, and all i said was "please dont talk to my boyfriend like that anymore, i dont mind you being friends, but i just want you to understand that hes mine. and also the things you said are very hurtful and you should watch what you say." so as to lay down the rule but not stoop to her level. then she started dating my cousin, ryan and then broke his heart. then she started dating my best friend/other cousin, laten, and i tried to warn him... and all the while shes still txting my boyfriend and even he told her to back off she has a "pet name" for him... "colty" his name is colton.. ugh... disgusts me. lol and then she broke his heart and now shes really starting to get on my nerves and im frikin tired of it... what should i do?

You could do the dumb thing and knock her out or you could do the smart thing and forget she exists, in fact I don't get why your bf even talks to her, by disrespecting you and your relationship, she is disrespecting him. Why does he put up with it?

Lol yeah i could... but the thing is... she intimidates me... shes a year older than me, in coltons grade , but seriously, ive tried that, ive tried ignoring her, being nice to her, being mad at her, EVERYTHING!

Don't let anyone intimidate you. Ignoring her means no contact with her, if she enters your space, remove yourself, don't about her, to her, near her, anything and your bf should willingly do the same after all of the boundaries she has destroyed.

Thanks!!

Hum..
Well first thing is first, she seems like the type of that like attention. And by you telling her something, she's getting exactly what she wants. Because it seems at if all she wants is a reaction from you.
Another thing your boyfriend should be the one to tell her something.
If he has any respect for you then he should tell her to back off.!