I’m sorry this has happened to you – it will take a long, long time for you to recover from this double betrayal. I’ve never been one for rushing in fancy-free women into your home with an able-bodied husband around, no matter how sorry you feel for her.
But never think of yourself as a fool. You’re a kind, generous, warm-hearted woman who should deserve admiration and respect. It’s your husband and your so-called friend who are the fools – for betraying you.
The only regret here is that you brought both of them together. You need to move on with your life and discuss how hurt you feel with your husband, and how you can repair the trust in your marriage.