[ihsw]

You'd be surprised how stressful it is to break up with someone.

You don't want to lose a friend but it is in your best interests to do it.

[alwaysdoit]

Sure, but presumably there would be a pattern of rising stress levels leading to the event. This looks like a square wave, which indicates an instantaneous change from one state of stress to another, which would indicate he was the party receiving the bad news.

[protomyth]

> You'd be surprised how stressful it is to break up with someone.

I'm human and 45, I'm really not surprised, but I'll play the odds on who did what to whom.