What might help is asking yourself the question: If a friend (or romantic partner) would act in this way, would you still be seeing them?

Better: if you had a friend and she told you this story, what would you tell her? Or, if you had a long time friend whose opinion you really trusted, and you really knew that this person had your best interested to heart, what would they tell you?

It's hard to be anything but wacky about your own problems. Somehow, you need to at least momentarily put yourself into an outside view so that you can better understand and evaluate your situation.

I've personally found that applying this kind of distancing helps, at least to gain another perspective.