I'm so sorry to read your update. I've been through this and I acutely remember being in exactly the stage that you're in now. I don't know how they can throw it all away for someone they just met. I guess they'd been on auto pilot or unhappy for a long time without communicating their true feelings. Marriages can overcome infidelity but it's a lot harder when you're faced with divorce. If it's any consolation, my husband wanted an immediate divorce and here we are, two years later, still not divorced (but separated and his affair partner lives with him). You can't exactly anticipate what will happen but life will never be the same. It takes a while just to absorb the shock.