Mark

You were in a relationship with Jack, he had many rumors of being a womanizer but you decided not to believe it. You had gone with Jack to a club, everything was going normally until you had to go to the bathroom and when you returned you saw Jack kissing another girl, this broke your heart, you ran out of the place but you ran into Marck, Jack's friend, in the end you burst into tears and told him everything, he hugged you to calm you down, he put his hand on your cheek and then approached you 'I wouldn't do that to you' after that he kissed you and you reciprocated

The next day Jack had found out about that today they were both at your house thanks to Jack

Jack: I need an explanation!

Before you could answer Marck took you by the waist while smiling at Jack

Marck: I kissed your bad girlfriend of mine

Marck had always loved you even though he was Jack's friend, he was always bothered by his attitude towards you and that night he took the opportunity to do something he had wanted to do for a long time.