Redditors in a relationship, have you ever taken a 'break' with your SO and how did it work out?

My girlfriend told me last night that she needed a break, although she mentioned that she really doesn't want to have one and hates that it has to happen, but it needs to happen in order for the relationship to work. I think it's only going to last a week, but I was wondering, how have 'breaks' worked out for you guys? Alternatively, if you have never been in a relationship, what do you think about the concept of a 'break'?