About
You vs. The Guy She Told You Not to Worry About is an exploitableTwitter joke format where the poster posts two pictures, the one on the left representing “you” and the person on the left representing “the guy she told you not to worry about,” who is generally an upgrade or more attractive looking person.
Origin
The earliest known instance of this kind of tweet was posted by @AmBlujay[1] on October 25th, 2015, shown below. As of August 8th, 2016, the tweet has almost 4,000 retweets and 1,550 likes.

Spread
The tweet format was copied a few times in the following month, but became a Twitter fad on August 7th, 2016, when tweets using the joke format featuring pop culture references[5][6] and meme icons like Harambe[3]and Guy Fieri[4] gained thousands of retweets. The spike in the trend made “you vs. the guy she told you not to worry about” a “Twitter moment.”[2]
Various Examples






External References
[2]Twitter – ‘The guy she tells you not to worry about’ is a meme sensation
[3]Twitter – @ProdigyNelson
[4]Twitter – @the_faisalahmed
[5]Twitter- @HndrixLamar