So, I got jealous last night about some girl on my ex-boyfriends facebook and acted like a complete psycho. I went off on him for liking her pictures and then I messaged the girl saying "hes all yours. have fun". Today, he told me I crossed the line by messaging the girl and that he doesn't even want to be friends anymore. I'm so upset. I made a horrible mistake. We broke up a couple months ago but have remained close friends. I honestly do not want to lose him as my friend. I dont know what to do. How can I redeem myself from this terrible mistake?