“ I make mistakes like the next man. In fact, being--forgive me--rather cleverer than most men, my mistakes tend to be correspondingly huger. ”
Source: Harry Potter and the Half-Blood Prince
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The quickest way to rectify that mistake (choosing the wrong person) is by learning from that, moving on, and choosing much more wisely in the future. 
The biggest mistake that people make is they try to be happier than someone else. 
A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing. 
We all make mistakes... so just put it behind you. We should regret our mistakes and learn from them, but never carry them forward into the future with us. 
All men make mistakes, but a good man yields when he knows his course is wrong, and repairs the evil. The only crime is pride. 