Read what Sandi wrote carefully. This online thing is every bit as dangerous to your relationship as a flesh and blood affair. Plus, it's easier to "cheat"...she doesn't even have to leave. Plus, she can tell you that you are being ridiculous. Your marriage won't turn the corner to anything better as long as it's going on. Perhaps you should get one of those key-logger programs and confront her with proof...then turn off internet service.
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer