I know this is local to you sir.prize but that is a plainly an inappropriate Suggestion.
By all accounts, the killer was deepy in love with the victim and did this terrible crime out of frustration or jealousy. She was aware that he was interested in her but was still meeting with him. I do not know if she was deliberately teasing him, but if someone is madly in love with you and it is not recipricated, then you should not keep seeing them. That is cruel. You do not deserve to be killed for it, as this unfortunate young girl was, but the killer should not be treated as if he is evil. Love is a very dangerous emotion sometimes, and people acted irrationally and extremely when under the power of it.