Her boyfriend lost importance in her face because of his passive behavior ("It's up to you to decide", "Your body is your business", "NORULES") and/or solutions that push her to debauch on camera. Her friends also contributed to her downfall, especially Stacey.
I agree that she suddenly left him without regrets, despite a good relationship and good compatibility in bed. She wasn't popular enough to suddenly put on a crown and abandon a lackey.
"If you're not a cuckold, then goodbye" is how their last dialogue can be described. It's a bit comical.