Leo was really emotionally immature and took JJ for granted. Leo needed a wake up call and didnt actually think the breakup would last til a few weeks in where Leo after realizing JJ was ready to leave started scrambling to get this shit together. I do recommend reading the entire story it’s a pretty decent drama, but if you really wanna skip it i think you could read the side stories without needing to read the main story JJ is super green aside from one scene where he was an asshole when they were broken up and js fuck buddies but aside from that man’s a saint for dealing with Leo for as long as he did

Why J.J break up with Leo at first? I want to read it, but I'm afraid of the angst ╥﹏╥