I Need Advice

Hi there I am here because I don't know what to do, recently I broke up with my ex-boyfriend and I tried to end it all on good terms we both made mistakes and I accept my part of the blame but it's like he can't or won't, I blocked him and fell in love with the most amazing guy he is just so wonderful he makes me so happy. So here's the problem my ex-boyfriend made a fake account on Facebook pretending to be a female and tried to add my new boyfriend he even messaged him saying "she was looking for friends" he told me right away when he got home from work and when we went to look for the account it was gone and for a few days it seemed like it would stop but today the girl followed me on Instagram, I would like to point out that "she" doesn't know me or my boyfriend.

My ex-boyfriend has done this multiple times since we broke up and even during our relationship but I just want him to leave me and boyfriend alone and I have asked him but he always does it again and now he is involving my boyfriend and that is crossing a line I know he is behind this and all of the other accounts but he just won't stop, what can I do or what should I do I just want him to stop and leave me and my boyfriend alone is that too much to ask