It’s still entirely possible that she didn’t do it and wasn’t more involved than being an accessory.
However, to be willing to continue to see somebody who probably did the killing is showing absolutely no regard for the victim.
I personally could not continue a relationship with such a person.
He’s probably still under her control. She was the mastermind.
She probably does not think that he committed the murder.
Rudy Guede, who is currently serving time in prison, had his DNA all over the murder scene. When questioned about it, he said that he had a ‘date’ with Kercher but ended up fighting a ‘mysterious Italian’ who attacked her and framed him for it (because he was racist, of course)