Why Did This Have to Happen

I have been secretly meeting with my best friend in his office for sexual encounters. his fiance found out today and because of me, his relationship and life with her is over. I am so scared that she will find my husband somehow and tell him and the rest of the world. We run in very close circles but I have never met her. I am so scared and crushed that not only have I lost my best friend, but his world has crumbled and we will never be able to lean on each other for ANYTHING ever again… apologies are nothing… there is nothing that can fix this and I am not only lost, but also there is absolutely no one I can talk to. He was the one I ran to when things in my life were tough, and now he is gone. My world is crumbling too. How do I recover from something like this… I am so sorry…