I don't think I could ever experience just relief breaking up. It's never that black and white of "I don't want to be around them at all"; you invariably miss the person you were spending all your time with.
Be careful making blanket statements about things you can't possibly know. I've had breakups that were unmitigated relief, due to my having horrible taste.
Yeah that slower rate for a bit before spiking back up, to me, indicates the reflective questioning of "Why?" that would likely come about after just a shade of downtime.
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.
Um, did you see the guy's photo? I'm going to guess no one breaks up with that guy unless he does the old trick of acting like a jerk until the other person wants out.
Plenty of people that are attractive and good (or at least non-jerks) that get broken up with. They don't necessarily have to be a jerk, just not a good match for their partner. Politics, views on marriage, mismatched libido, kids, etc.
Some studies suggest we date people of compete able attractiveness. Whoever he was dating was most likely as good looking as him and would not consider it a blessing to stay with him.
I dated someone once who was really great, did everything right, perfect on paper. However we broke up because I just didn't feel anything, there was no chemistry and sex was boring and lifeless. Sometimes that happens and its nobody's fault.