The two dated for four months, with Holly jumping right from the mansion into the relationship.
A source close to the couple tells E! News, "She was very much in love with him, and they're still very close friends. It was a conflict of schedules.
"She felt she couldn't devote 100 percent of her time in Vegas and his career at the expense of her career and her goals."
The source added that the decision to split was mutual. Holly had been shacking up with Criss at his lair in Vegas, so it looks like she’ll have to find another guy to live with.
The source tells E! that Holly has decided to move back to LA to pursue her “career,” whatever that is, and that it was a very hard decision for her to make because “she still has very intense feelings for him.”
Let’s just hope she doesn’t come crawling back to Puffin now…