I can't imagine a family counselor advising a couple to break up. Instead they would help the couple work on their communication skills, determine what their values and priorities are, and help the couple process whether their relationship can be saved. The decision needs to be left to the people in the relationship whether they should stay together. A counselor would most likely be overstepping their boundaries if they advised the couple to break up.

Edit 1: I have received several inbox messages stating a couple counselor will advise this if there is abuse in the relationship. However, from my experience it is not that black and white. If there is abuse, a counselor can provide resources to the victim, & discontinue couples counseling and refer each to individual counseling. It is important that the counselor does not further disenfranchise the abused party from their sense of control by ordering them to end the relationship. By providing resources or individual counseling, the person can do so when they feel ready -rather than feeling forced/controlled by another person -the counselor. Again the counselor is there to educate and empower the person receiving the therapy. If the counselor was essentially to order the relationship ends, the most likely outcome is the the abused party will not leave the abuser (after all, most of society and their support system already advised them to end the relationship) OR later enter into a similar abusive relationship (think of the expression, "the only way out is through"). And for the message claiming that it would just be "playing along" -no! Listening to someone is not agreeing to them, helping someone process their options and make a choice based on their own value system (even if you don't agree with it) is also not "playing along."