Aristocrates,
While it is important to pay attention to the details presented in the dream, remember that it is of equal importance to remember the feelings that were brought out by the dream experience. Dreams mirror our deepest feelings and emotions etc. and your dream seems to be showing that dealing with your ex is an annoyance to you. Such contact in waking life draws you in but in reality it is counter productive to moving forward.
Stepping back a step or two and seeing a bigger picture, (looking at the dream in the same light but in a more general way), the dream is about a control that your ex has over you. Apparently your life is disrupted when there is contact or perhaps event just the thought of her (or people in your life that are like her) is a disruption and it is annoying.
The dream brings to consciousness these feelings within and allows you to explore how similar situations make you feel.
regards,
sailrmc