Dear Abby: My co-worker turned against me and I don’t know why

Two readers have sought advice from Dear Abby regarding deteriorating professional relationships. One individual reports feeling singled out and undermined by a colleague, creating significant tension in the workplace. Another reader describes a situation where a longtime friend and co-worker has suddenly turned against them, frequently throwing them under the bus. Both cases highlight the emotional distress and professional instability caused when colleagues shift from supportive or neutral behaviors to active workplace hostility.