He realized it was bad idea to bet with his friends about you, allowing one of his friends to try to seduce you with sweet words and maybe light touch.

He watched with his friends from distance, clenching his fist in jealousy, knowing that it's just a set-up, which he was involved in. Promising himself never to make stupid bet like this again. His other friends teased him.

On other hand, you dont understand why this person, who you know is Scara's friend, tried to hit on you like this.