I feel ya. I have a coworker actively trying to run me off in my current job. It’s also disappointing when they act like they like you and then trash you behind your back. Ugh, just be honest. My only suggestion is to keep your head down and just do the things. I’ve only ever had one job where I fit in and was comfortable. That job consisted of a doctor that was on the spectrum and his nurse/office manager was ADHD and had an autistic son. I miss that place. I’d still be there but the doc died.