Hi harysc, you may be surprised that part of you wants to forget her and is angry but another part of you misses her. Seven years is a long time to be in a relationship with somebody, so it's natural that you might still miss her and find it hard to move on.
You may want to read this:
Perspectives: The Biology of Breaking Up for some further insight.
Please check out the lessons in the sidebar to the right hand side. You see where it says "Attachment leads to suffering, detachment leads to freedom"? When a romantic relationship ends, there can be a period of grieving for both what it was and the dreams you had for the future of the relationship. Just like in grieving a death, there are stages and we can often get stuck or go backwards sometimes.
How often do you think about your ex? Also, what things are you doing for yourself? Things to stay healthy and to live the best life you can?