How to stop stalking your bfs ex…

This is a long one please bear with it.. It’s been half a decade i obsessively stalk his ex i have gone extents…to understand what is she doing now, and get triggered and hurt when she is doing well.. this has me nuts why would i be so triggered when someone is doing well!? I find my often people pleasing others… so that they think i am better than her…this is extremely exhausting man….ik i am better but what is this constant competition i have within my own mind…last 5 year i did everything just to prove i an better…i tried everything…what do i do?? This is nuts…I feel so anxious and my heart start pounding when i see something on social media…not even her feed but just profile picture….even if ik it’s edited she doesn’t really look like that…social media is fake ik still i find myself in this rabbit hole. What should i do? It’s affecting my daily life i just cannot focus on myself and try to excel myself in things she is good at,go to places she has been, whereas i myself individually would never try such things or visit those places. Please be kind, ik this is ridiculous! My partner reassures me 100 times, he never brings her up and is fully head over heels for me i keep self sabotaging myself…. Has anyone been through this…. How did you tackle…please let me know i am really desperate to get over this