You're still trying to use the bad events of the last six years to justify why Adalind wouldn't have a romantic relationship with Sean. You're ignoring that Adalind has changed and furthermore, forgetting that Meisner's ghost haunted Renard until he forced him to change. Those are good things. If Nick died, Adalind has no means of support. Her only viable option is to go to Sean for help.
The best way to frustrate a cyberbully is to ignore him.