Single folks need to stay out of the business of married folks business. Married folks dont need to advise single folks on being single just as the single advising the married how to be married. It is easy for a single person to find or see flaws in a relationship that doesnt belong to them. Some single people continually find fault and unsolicitly advise some married people as to what they believe that they should do in their marriage. Married folks need to stay out of the business of marriend folks too.
Relationships arent always fantastical. They take work - a lot of dedication. There will be rough times, need for compromise, possibly some agree to disagree. This is within any relationship. It is easy for one to tell other something that they need to do to better their situation with not much regard to what makes them qualified to do so. Just my thought.