Why do I sense my ex’s energy around me even after breakup?

Name: Tania Roy

DOB: October 17, 1996

Time: 12:40 PM

Place: Guwahati, Assam

I had broken up with my ex 3 months back, but I still have flashbacks with him in my head, and it happenes eveytime I am alone.I feel as if his energy is still connected to me. I dont have any of this stuffs with me too, but still i feel like this? Could you suggest me any aura cleansinf crystals so that I could get rid of whatever I still have of him inside me.