so wait lemme get this straight
you still like your ex
but you're not going to do anything about it?
idgaf if you're 12, man the forget up and tell her, she could still have feelings for you and she's just confused. If you're wrong, you're shamed for a week and you get over it. Honestly, this shouldn't be difficult to grasp.
Otherwise, get over her and be friendzoned and start to play with them on BL, because honestly that's typically how it goes when you know someone: you constantly watch them and what they do.