affair on engagement day

On a happy night, the girl was engaged to Argantara. Argantara was 26 years old while the girl was 20 years old, they had a 6-year age gap.
Sunday night was the day of Argantara and the girl's engagement, but before their engagement, Argantara had an affair with the girl's best friend named Zeliya in a toilet in the building where their engagement was held.
When the girl was about to go into the toilet to check her make-up, she was surprised to find Argantara being kissed by her best friend
"arga... zeliya.. you guys."
said the girl with a trembling tone and a weak body when she saw them kissing
Argantara was shocked when he heard the words of the girl who entered the toilet.
"You... why did you come in without knocking!"
Argantara snapped at the girl
Argantara did not show any guilt at all and instead he hugged his mistress in his arms

Come on guys, just continue on your own

he is an engaged man