Okay, they were together, they were apart, she showed up dead. We know that much.
That may look damning in the media, but sometimes fights between boyfriend and girlfriend are the prelude to a breakup, not just a homicide.
What has not been shown is that he killed her. One angle of defense here is that she and he parted ways after an argument and he drove home, where she was picked up or out by some predator and killed by a third party. I'm not taking either side, although she is the clear victim here, of someone.
Running? Hell, the media has the noose tied already, so even innocent, he'd likely make tracks.
We saw what happened to one of four cops in Minneapolis who was kneeling on an OD'd addict and could not have killed the man from that angle, all because of trial by media, so even if the guy is innocent, he won't get a fair trial.
I'm not ready to hang anyone just yet, at least not in this case.