SERIOUS problem with friend(at least i think she's my friend...)?

So I have this friend and we get in a lot of fights. I know that at heart she's a great friend, but we get in lots of fights. Thigns like she is lying to me, blowing me off, like she doesn't care about our friendship. I don't know whether it's appropriate to end it, or forgive and forget. The number of times we have gotten into quarrels is uncountable. PLZ help me? Ineed to know whether I should keep on forgiving and forgetting or to end it...