A pendulum swinging is an excellent description of how we all feel, WS and BS!! I am a BS and I am 10 months past Dday. My husband of 32 years had a 4 year affair and it went way, way beyond what you have described your WW doing. Meetings and sex in different countries while traveling on business. I am glad you have what looks like a time line of your wife's indiscretions. If you are satisfied and happy with them, and her, then you are ahead of the game.
I personally think we pendulum so often because we are reeling from the total shock to our systems as BS's. I suffered 10 different PTSD symptoms and needed medication to get me back to some sort of equilibrium. But even now I have days where I start on top of the moon and slam into the wall by nighttime. I chalk it up to my deep inner conscience keeping me safe by tell my heart and my mind not to get suckered again.....no more hurt....make sure what you are seeing, hearing and feeling is truthful and real before committing and trusting again. I also think triggers and very stressful situations tend to reverse the pendulum swing because we just can't handle to be overloaded right now, I sure know I can't!
Slowly the pendulum is taking longer and longer to swing the other way and we have actually experienced several weeks of positive, happy times together. We are well on our way to R and I think it is because, at month 8, I decided that I couldn't hurt forever and that I had to start looking at my WH reconciliation actions in a positive light. He has done everything I have asked of him and more. He is truly committed to the healing process, therapy both MC and IC, and to showing me how sorry he was. At some time all of us have to start to trust others again.Me: BS 50
Hubby: WH 53
Together: 32 years
Married: 25 years 09/10/2013
2 boys: 23&21
A length: 4+ years (yes years)
status: Ongoing Reconciliation :o)
Through thick and thin we will survive but he gets only one shot at it!