What should I do ignore him?

So ballet class is open again ( in my town ) and it’s literally a two min walk from an ex guy friend apartment cause we used to hangout
but basically if I see him walking I don't know what to do,..
its been two months there was drama with a third party ( his sister and her now husband but was her boyfriend ) and he doesn’t want to talk to me blocked me on Facebook, Instagram and wanted me to stop and leave him alone.

i do wanna reach out but I’d prob look bad and so should I just wait until maybe he makes a move and just ignore him if he sees me...
What should I do ignore him?
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