Move on. It doesn’t mean you couldn’t end up with her in the future. It just means don’t get hung up on one girl who isn’t ready for a relationship with you. Because she’s not ready for a relationship with you like you want nor is she willing to work for it (right now) with you.
Also, I’m not sure what all these feelings her and her new guy are confessing to each other are. Maybe they’re rather shallow feelings but they’re both having fun with it.
If she really wants to be friends with you just tell her you need a little time with that bc of how you feel about her. If she cares at all about anyone other than herself she will understand.