I know what you’re going through. It can be such torture and extremely frustrating to have that person’s energy entangled within you when you’re no longer involved with one another.
There are a myriad of routes you can take to cleanse his energy from your auric field. I suggest reading these very insightful articles, which can help if you follow some of the tips.
I also highly highly recommend practicing guided meditations that were created exactly for cutting energetic cords.
I send you much love & light. ❤