50 Singles Tell The Lesson They Learned About Love From Their Latest Breakup 

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18. Cheating is a non-negotiable red flag.

Refusing to take responsibility is a red flag.

Ignoring your s/o is worse than arguing against your s/o which are both inifinitely worse than communicating with one another about the topic at hand.

And the best one: you have to love yourself more than you love being in a relationship.