Someone who promised not to leave but then leaves anyway. And soon enough, he's got his arm 'round a brand new girl, and while you're picking up your heart he's been pickin' up her.
Hello Mr. Perfectly Fine, how's your heart after breaking mine?
by ConeyIslandGirl.xx June 8, 2021
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A person who is completely fine after a hard brake up that you suffered a lot from. This is also used in a taylor swift song titled Mr.Perfectly Fine.
There goes Mr. Perfectly Fine with his new girlfriend after 2 weeks!
by Liya Chante April 10, 2021
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