sick of betrayal

Growing up I began to realise I couldn't rely on my friends cause they'd all betray me one Way or another. But then I fell in love and thought wow this man really finally gets me. He took my virginity for granted and then dumped me when it got tough. Made me feel like nothing. Then a month after he fucked this girl (several occasions) who, although I didn't like, always let her lean on me when she did stupid things like cheat on every single one of her boyfriends. She did it out of spite I don't know why cause I always try to be there for her even tho she makes the worst life decisions. No one told me because I was depressed after he broke up with me and now I found out im so angry and I have my up coming final exams in a week! I do not need this