Calling somebody in the middle of the night when you are a teenager or a student is normal. Us calling would be an emergency because we think about how the other person might be feeling when we wake them up. (And they are older, and they might have insomnia. But tbh, I started considering others’ feelings re. night calls after I got my first child, and that’s when “being kept awake at night” suddenly got a different meaning.)
Young people usually go to bed later and sleep in, and I can’t even say that waking someone up at night is egotism - just a different perception of the world. And also, “friendship is round-the-clock” concept.
So, no, a night call in their group is not an emergency. And, I also observed how young men behave when parting ways. Not to tarnish the relationship between JD and KG, because if K’s mom believes they’d essentially get together, I accept it. But whenever one of sons would initiate the break up with a girlfriend, it would be for someone else. If a girl would dump him, it would be, “I wanted to be together forever, I am so sad… now, where do I find another one?” It is also an age factor, and the fact that there are many young women around. In short, if the relationship between K and J was normal, not abusive and not controlling (and so far I never heard anything to the contrary), he’d have zero reason to kill her, just nada. He would be either mourning the loss of the relationship but subconsciously, putting out feelers for the new one, or being sad but hopeful for getting back together. No reason to kill her, her friend and two roommates. Plus, JD knew the family, K’s friends, housemates. Would he ever plan it so sloppily?
Actually, JD is the one off my list. And I sympathize with him, and feel that it is a huge tragedy for him, as now K is neither an ex- nor “maybe still”. She is his first love who departed too young, in a horrible situation, and all that he has left from his first love is the dog, Murphy.