Any tips on how to end a friendship. Or even if I should.?

wait for my friend to text me adn i always think when i see that i get a new message i think its from her and when its not i get dissapointed at times. if she acts off towards me or text me a short answer i get really bummed out and feel like shes mad or something at me when i know shes not. she might just be tired or soemthing. but when she starts chatting away i become alive. i dont know how to not be so dependant of her. shes my best friend but she has treated me like crap and i finally confronted her about it but ever since we have talked about it our relationship has gone down hill i feel. all we talk about is our problems. we used to laugh all the time but now we just sit there and watch tv. its not the same... i miss it but she is really negative towards us as if shes not trying and since i base my mood off her it doesnt help. we went t othe same high school and i pretty much followed her to college and i am still tehre with her i feel like i have been based my life off her and i want to make a change but i am afraid of letting go and having our relationship go to ruins but i feel like if i dont move on and go to a diffferent college and do my own thing im never going to grow and im gonna feel like im stuch on her hip all the time. Now should I tell her? Should I confront her and be like I'm moving on. I can't do this anymore. Or should I quietly distance myself? She won't miss me that much. She seems to be living her life while I'm stuck here following and living mine based off hers.. Any tips?