fall head over heels in love with (someone)
To be completely enamored of someone, typically a new romantic partner. Oh, I know he's fallen head over heels in love with Christina—he won't stop gushing about her! How can you say you've fallen head over heels in love with this girl when you've only been dating for, like, five minutes? I can tell April has fallen head over heels in love with her new boyfriend and doesn't want to get back together with me.
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