Most Helpful Girl
If I were you I wouldn't "end it for good" this could end up a total mess. What ever you do don't use the pick up line " I'm not good enough for you and so I think you should move on" because she might take this as an insult... The best way to slow down is to talk to her about the situation and mention how you two should have a break. That you love her dearly and still want to talk all of the time but that the friendship is very important to you and you want to focus on schooling and maybe in the future that you two could become more again (not saying that you will but it's a good wa to put her down gently).