I think I'm tired of being insecure and jealous
Why would you feel that way?
I've heard that two former lovers (who've cheated on me) are having sex with each other. I hate them both for doing this.
You should move on with your life and past relationships. It is not good to be jealous of people you have broken up with for a reason or another.
I'm going to make my ex boyfriend tag along with me to my third ex boyfriend's wedding.
You have got to let it go and you will find yourself happier. Why do you maintain contact with your ex-boyfriends? They are the underlying reason for your jealousy, so getting rid of them will make you less jealous.