Shi qingxuan is your ex, you guys broke up after you realized you stopped having feelings for her.

It was one night where you were invited to a house party, and you saw your ex. Drinking and dancing with her friends, you tried to ignore her

She bumped into you after one of her friends pushed her

" oh!...uh..sorry. " she then went back to her friends. That's as weird....maybe you should talk to her.