stay married on a fuck board is probably not the best idea. Having said that, I am going to give it a shot. Deep down you should know what you want to do. But I see only 3 choices.
#1, apologize and make up, stay married and stop hobbying.
#2, apologize and make up, stay married and continue to hobby.
#3, Split up and get ready for a nasty divorce ( it almost always is nasty, very nasty ). Unless you are one of the very few lucky ones - like lottery winner lucky.
#1 is probably what your wife would like you to do.
#2 is probably the best outcome for you, but given that you got caught the first time around. Not sure how good you will be at keeping it a secret...Especially now she will be constantly checking.
#3 might seem great: hobby full time-no more sneaking around. But I honestly think that this would be a short-term gain. The great sex physically or happy feeling emotionally last only till the clock runs out. I dare to say even OTC sessions will not last. You can ask any provider if they are willing to spend the rest of their natural life with her OTC client/buddy and I am willing to bet 99.9% would say no thank you.
You sound a little depress in your post, just look at it this way. It is not like you just found out you have cancer and you only have 2months to live. I hope everything works out for you