She broke my heart, should I forgive her for this and overlook it, or should we discontinue our friendship?

I'm a very "keep to myself" type of person, and a few months ago I shared what I was thinking about as a career with one of my friends, this was something that I rarely do, with anyone, even her and also something I hadn't discussed with anyone; we talked for about an hour. A few days ago she acted as though it never happened and she asked me what I was thinking of pursuing after high school, and kept saying "you don't have any idea", "you don't think about it, Melanie". I was HIGHLY offended by this, evidently she doesn't care and doesn't remember. She always wants me to share things with her, and she doesn't even remember what we talk about? I don't think I can overlook this? Does anyone have any suggestions on how I should handle this disappointment in our friendship???