Relationships are complicated and though it sucks, it is ok for people to say that someone else is their best friend. It will hurt but that doesn't mean that you aren't important. Saying I don't love you is also ok to say. It hurts like a bitch but if thats how they feel then thats how they feel. While voicing it isn't always polite it is ok to say. People suck ok, but sometimes you just gotta take a step back and understand that they aren't and shouldn't be as important to you as yourself. Make sure you value yourself and understand that no matter what anybody says you are loved, if not by people at least by yourself. Make sure to not base your value on how others perceive you ok.
@Jazzy_TheAuthor, sorry if this offended you, I just meant that what she said was sucky and that its ok that you were hurt but to remember that people will say stupid stuff and that you are strong