hey i was just wondering if there is anybody that i could talk to that could help me...

so my best friend and i are inseperatable because one we r bestfriends and two we r in love with eachother.. and im the sorta jealous type.. we have been on and off argueing cuz i believe that them and their ex shouldnt b talking and hanging out so much even when the ex still continues to mess up but my bestfriend disagrees... well now their old bestfriend throughout elementary and middleschool before they moved just came back into their life..and they r starting to have feelings for that old friend..and im constantly being put after this new yet old friend and its making me cry myself to sleep all the time.. and all i want is for my bestfriend to b happy..

what should i do?..