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I hate this quote, mostly because it is referring to a relationship. If there is only one reason why you should stay, you need to leave. Do not settle for this person that makes you question your feelings towards them. Don't settle for the guy that gives you these other reason to not stay! Stop settling get the hell up and move the hell on
My philosophy -since the selfishness people are capable of can be overwhelming stick to this and you'll never be at their level...