While it's likely that Mateen's conduct was influenced for the worse by their relationship and break-up(s), it went pretty far into 'misogyny' terrority, and can't really be justified.

I mean, I've said some nasty things in the heat of the moment through and after a break-up, but nothing like that.

That said, I agree the author could've done better. I was very confused by the introduction of 'Munoz' without describing who he was, for example. I get the impression the article was written in haste for maximum 'relevancy'.