Rose-colored glasses. We all come on here wearing rose-colored glasses when it comes to the WAS. Turns out, when we find our feet, that our spouse really isn't all that. Sometimes, when we face the truth honestly, our spouse needs a ton of work and we shouldn't take them back anyway, until he/she has worked through the issues they have. Your wife hasn't just left you...she left her kids. That ought to tell you something without even adding in that she slept with a child (I'm sure he got some mileage out of that bragging session), she slashes herself, and she has absolutely no sense of responsible spending.
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer