How do I get my power back?

I feel like I have been blindsided. I am in love with a guy who doesn't seem that in love with me though for a time it was the other way around. I was the one who wasn't as infatuated with him as he was with me but over time that has changed and now I can't wait to hear from him. Just to get one text from him sends me into a frenzy.

I want to know how to stop feeling like this? How do I become like I was when I didn't care as much? And does he know he has this power over me now?
How do I get my power back?
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