I love the Frankl book too, Minnie! My copy is worn to the bone. I like the idea of remembering I have the freedom to choose my attitude. You might want to try that too, ghostgirl. It's right up there with contrary thinking. When I find my mind tending toward obsession, I consciously steer it elsewhere. It takes some practice, but gets easier with time.
I also had to do the work (through therapy) to figure out why I wanted his attention so badly, when I knew it was not good for me.
Keep posting and take care.