Sara, All of you feeling that you having are the the feelings of a BROKEN HEART! Not sure if this is your first time? Time is the only healer! I ha been through it many of times myself! and I am going through it right now! and for your so called girlfriend! she’s not your friend! friends don’t bed down with a friends mate! you should have nothing to do with her anymore! OR HIM! He will probably cheat on her. Then YOU can have the last laugh! Mean while stay busy focus on picking yourself off the ground! Good Luck!