Andrew, I agree with what Labug and Busting said. Don't feel bad about what happened. Your W had an A, and she's still texting the OM, so anyone would've felt the same in a similar sitch. Just try to be prepared for next time these feelings come so you have an outlet other than calling your W.
I remember being obsessed about checking my H's calls and even thinking about installing a tracking software in his computer. Never did it, but thought about it. One day I looked at his odometer, and he had driven xtra 10 miles the night he went to hockey--the exact mileage to go to the OW's house and back. When I asked him about this, he was outraged and angry. I explained how hard this was for me. I think all these things definitely damaged our R even more :-(
