I started an affair with my friend's husband
Why would you start an affair with your friend's husband?
I'm not sure, its just the way the world works sometimes. We just feel in love.
It is not good to cheat on your friends partner. You should stop before you destroy any and all relationship with them.
What? It's not that bad, my friend's husband is a slut and we are having fun anyway.
Your relationship with your friend is based upon trust and you sleeping with their husband is a real breach of that trust. Your character will be ruined if you keep this up and your friend will end up hating you.