@ilusami I’m confuse. Did you send the intimate pictures and messages to your ex while you were with the present guy? A word of warning: NEVER send out intimate pictures to anyone!
It sounds like you were trying to make him jealous by taking some pictures with a casual friend and then posted them?
Start no contact for at least a month to give him a chance to calm down and think.. Do NOT get his friends involved in this!
Good luck:)