My fiance cheated on me with my sister?

Anonymous
I always felt that my fiance was obsessed with my younger sister. Around a few months ago, I noticed that he was liking my sister's pictures on Facebook. I didn't think much about it there and then, but I was aware that something was fishy.

Three days ago, my fiance invited my sister over to play a new co-op video game. Coincidentally, we ran out of groceries so I went out to buy some. When I came back, I couldn't believe my own eyes when I found them cuddling and kissing on the couch. I lost my temper and stormed at them as I screamed. They let go of each other as soon as they saw me, and asked me to calm down. I've had that suspicion for a long time, and it turned out to be true. I told my fiance that we were over and that I never wanted to see him again while I walked out of the house crying. My sister followed me and tried to comfort me while I cried, but I was angry.

My fiance tried to text me saying that he loves me and that he would never cheat on me, but I blocked him on all social media.

I have nowhere else to stay so I'm currently living with my parents and sister. I've been trying to avoid my sister, but she keeps trying to apologize and start conversations with me. She says she feels extremely guilty and that she'd never want to hurt my feelings.

I had a talk with my sister this morning. I asked her if there was anything going on between her and my (ex-) fiance, and she broke down in tears. She admits that they had been intimate with each other several times over the past few weeks, but she says she turned him down every time he asked her to have sex.

She apologized constantly while crying, but I told her to leave me alone. She wants to make up to me, but I don't know if I should forgive her or not.

How do I handle this? My life has fallen apart and I don't see the point in anything anymore...
My fiance cheated on me with my sister?
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