@Waa-Aniga
One toxic team member is all it takes to destroy a high-performing team.
Toxic team members are destructive because they
Create unnecessary drama and distraction. They suck the positive energy and creative brainpower out of the room. Team members waste precious time watching their back, instead of openly innovating, taking risks, and speaking up candidly about what’s on their minds.
I don't know exactly what you are going through but these are the advice I can give you.
take care of yourself. Don’t let this toxic behavior damage your emotional and physical health. Own what you can, let go of what you can’t influence, and make a change if you have to. If you have worked your tail off to develop better relationships with your saboteur coworker(s), and it’s going nowhere, or getting worse, consider seeking the advice of an HR professional or trusted mentor on what else you might try. But if you’ve done everything you can, you should consider leaving. Life is too short for work to suck the life out of you.
Talk with your boss. Proactively suggest to your boss that the team hold a meeting to set up team norms and begin to address some of the challenging behaviors and conflicts on the team. This session should not be a ruse for taking the toxic team member to task. It should be a real and authentic interaction, in which team members can gain insight into one another’s perspectives, set clear standards of expected behavior, and increase peer-to-peer accountability.
I hope I helped.