"Before leaving the company at last, he had received multiple sanctions including an interdiction to get too close to some women who had worked with him."

That sounds quite far away. He did not get info after first two and still honestly does not understand his behavior is not welcome? I mean, if you get the note from HR that you are not allowed to approach person x anymore, then maybe the seducing strategy does not work? Then again, people are not all that rational in general.