I'm a 19 year old female and I'm fooling around with my best friends fiance.
That's horrible! Why would you fool around with your best friend's fiance?
Because it's fun, and I like to play with my friends' emotions.
You are someone who likes to push the buttons of your friends. This action of being intimate with your best friend's fiance is really immoral to say the least. He needs to be faithful and you should respect your friend. Drop the idea and move on otherwise you won't have either as a friend anymore.
Friends are just friends. I don't understand why people want to hold on to that.
People want to hold on to friends because friends make your life feel fulfilling. Having friends you can count on allows you to feel safe and secure knowing you will have people to support you. That's why you shouldn't be having sex with your friend's fiance.