blow hot and cold

Could you teach me how to use this phrase "blow hot and cold"?
Thank you so much.

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Originally Posted by panicmonger

Could you teach me how to use this phrase "blow hot and cold"?
Thank you so much.

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As far as I'm concerned, this phrase is concerned with the intensity of feeling or passion. However, I'm not sure how to use it. For example: Can I use it like this: You always blow hot and cold, nothing is perpetual in your interest.

Thank you very much, have a nice Sunday ahead.

I can't tell where I am in my relationship with Maria. She blows hot and cold. One day, she asks me to be her date at her cousin's wedding, the next day, she's too busy to even get a cup of coffee.