Whomever suggests "taking a break" is essentially saying;
"I'm not sure if (you) are "the one" for me."
Essentially they want to put you "on hold" while they make up their mind about you and the relationship. Most of them don't want you to date or see other people even though they themselves are using this time to evaluate "their other options". Allowing them to do this gives them power over you as they keep you waiting in limbo.
Lets face it, "a break" is a breakup!
Some people have used the strategy of "taking a break" while knowing full well they're moving on!
They're simply trying to keep their soon to be ex from freaking out by giving them some (false hope). A couple of weeks role by and then they break the news to them that "they've decided" to walk away.
In other instances people have used the "break" to have flings with other people. This may be with new people or even their exes.
In their mind it's not "cheating" since "We were on a break from each other". There have been some instances of high profile male celebrities who have conceived what are now called "break babies" with other women outside of their relationship or marriage.
No couple resolves their problems by being apart from one another unless breaking up is the solution!
If married couples took a "break" every time issues arose someone would have to have a bag packed sitting by the door. If you walk out stay out.
"Never love anyone who treats you like you're ordinary."
- Oscar Wilde
If someone tells you they need a break from you then clearly they don't think you're all that "special". One man's opinion!:)