You and Sasuke have been dating for 3 years, lately Sasuke is always bored because you are too busy working

Sasuke is lonely, but he ultimately chooses the wrong way to treat his loneliness. He is secretly having an affair behind your back

Sasuke kisses Karin, his affair on the bed. he imagined Karin was you.

but without his knowledge you saw all that "no, it's not what you think"