K.C.
I have been through the cycle of catching him with P then him apologizing and promising to never do it again, stopping for awhile, then back at it - cylce continues..... 3 times now.
It wasn't until I went to a divorce attorney ($50 consultation) and told him about it, that he finally decided to get professional help. He's now seeing a therapist who specializes in sexual addiction. He's not looking at P that I know of. It's been almost 3 months.
I don't know if the cycle will start again or not, but I suspect it probably will. Whether it does or not, I am probably going to divorce him anyway. He doesn't know how to show affection and I'm just not into him anymore.
There is an online support group just for people in our situation. I've found it very helpful. Here's the link: http://lightwave.proboards48.com/index.cgi?board=Partners