I broke up with my boyfriend 3 days ago. Since then, this best friend, who has a girlfriend has been chatting to me everyday. We have begun to trust each other and enjoy texting each other. Lately he told me that someone told him that 'the lesson they had learnt in life was to cheat at least once in your teenage years so you don't have the temptation to do it while your married' And now he wants me to be that person... What do I do?