It seems Madonna has grown "tired of the baggage that Tracy always seemed to be carrying with her." Anderson had insisted that her trainees abstain from any other form of exercise — no yoga, no running, etc. But it looks like the
devotion narrow focus Tracy demanded has become worn out and no longer a two way street. A source told Page Six that "Tracy had grown to be more of a distraction than anything else." It is rumored that Madonna was upset that Tracy didn't accompany her on the last leg of her European tour.
For Tracy's response, continue reading.
Anderson's publicist had this to say of the breakup, "After working together for three years, Tracy and Madonna mutually parted ways because Tracy wanted to look after her son."