Help please................?

rite you were wit a fella for 2 years and there was a house party going on and we go....... but you bring a friend from school.......... everything is going grand until i get really drunk and you have to go home but before i did i got really mad wit my fella before i left because i found out he shagged my best friend wen we were on a brake and he also cheated on me wit someone else............ but i also done it to him as well........ but once i left he shagged my friend from school wat do i do i am still mad about him and want to forget about all of it