Ok after seeing Leo's memories with JJ I can't hate Leo I still stand with Leo and I hate ...

So it only matters if hurting was done on purpose?

Well yes when you truly love someone you can't bring your self to hurt them , jj choose to hurt Leo and break up with him without explaining on purpose and was OK watching him getting hurt , that's not love , that's not lack of communication this is being a dick and childish and vindictive towards the person who he allegedly loved and lived with for 5 years ,, there were a lot of choices and other ways for jj to deal with Leo other then thus and he choose to hurt him and watch him suffer

He wasn't enjoying Leo suffering nor is simply watching him suffer. JJ was choosing himself and not be a doormat anymore. The story is pretty much told in Leo's perspective so you are seeing JJ as if he didn't talk, when obviously its in a perspective of someone who has been dismissive of someone. But bits and pieces we see JJ actually speaking up, not upset but is speaking. Communication does not mean being upset to be heard.

JJ left. It was Leo's decision if he wants to fix it or not but JJ is leaving. And it's inevitable to hurt someone when you leave them. Whether he gave an explanation or not, Leo would still be hurt. Making it an excuse is just again another way of spoiling someone. If it's always about not hurting the other person, then someone like JJ will always just be a doormat and never giving themselves the proper respect they should have for themselves. I am not making ch 14 an excuse with JJ's behavior because it was written too much, it was not parallel to what should have happened. But removing that stupid decision from the author, JJ was simply choosing himself. If JJ is speaking rude to Leo, it is because Leo is acting like JJ will just forgive him anyway, without actually thinking himself how he has been behaving. All you saw was Leo's perspective and how he showed he loved JJ. As if JJ didn't show his as well. And it seems that being proud of being in a gay relationship, and planning to buy an expensive gift for them, is enough to make someone feel that they are not taken for granted, despite everything else that they have experienced.

If JJ was childish and vindictive, then he would've done everything to mess Leo's car or reputation by making rumors and what not. He did none of that. All he did was leave.