Friend Problem?

Ok I have 3 major friends. Donna, Valerie, and Patty. At first me and donna were like the best of friends. but then when i met val this year it got complicated. see donna hung out more with val and me with patty now me val donna are really great friends and patty got really mad at val so now she won't talk with me either! I need help. and donna she always becomes on and off more friends with val then with me and i have known her long