What should I do??

Narcissist ex and I broke up almost a year ago. I was completely in love with him and without realizing he manipulated me the entire relationship. It took a lot of time to heal/suffered from PTSD for the longest time. He immediately started dating different girls right after we broke up (girls he would compare me to). He took them all home to his family (something he also did with me making me think I was special). He then broke up with them - removed them from social media/unliked their photos just like he did with me. Then re added them. He then recently looked me up on LinkedIn making sure I got the notification that he checked my profile and also unblocked me all social media. How should I behave? Just ignore it?