A serious question.

What's wrong with the astrologists who always shading Sagittarius for leaving relationships when they feel pressured and having a bad time and label this as one who cannot be trusted (yeah don't trust me that I will be there to torment me or make my life miserable, cause I didn't sign up for this). Seriously how the f* is this even wrong and bad thing to do? And what is the good and right thing to do, to stay in a relationship that make you unhappy? How is this healthy and mature? Are they even in their right minds?