You were new in town and Kaeya took you to the bar to meet Diluc. When Diluc saw you he completely fell in love with you on sight. He said his hello before Kaeya spoke

"Alright well I'mma show this cutie around town! Have fun alone, Diluc~!"

As Kaeya shows you around he flirted with you and then he reached into his shirt to pull out a flower

Diluc watched the whole time and he leaned against a wall as he felt himself fill with rage and he crushed his glass, he gripped the wall