I Come From a Broken Family

I just wanted to talk about how my aunts husband cheated on her and had a baby with another woman, the woman loved him and lied to him about taking birth control when she was not. it broke up my entire family, my grandparents two of them died.i am not allowed to talk or see my cousins or aunt.I just hate the fact that i'm not allowed to see them, i really enjoyed being with my cousin when she was a kid but her parents were together and in a happy marriage. i feel like i don't know much of my family besides one grandma and grandpa. I am afraid when i get married my husband will cheat on me. my mom thinks that people are not supposed to be monogamous and they should be allowed to cheat otherwise they will divorce, that really scares me because i don't want this situation to happen to me. can anyone try to help me get over this fear? i just hope that people are supposed to be monogamous but i can not seem to convince myself of it because my best friends parents were divorced, all four of my grandparents are divorced and my mom wanted to divorce my dad when i was a kid. cheating is the worst thing that can happen to me, but divorce is bad too.