I am sorry for the pain you are going thru. Please understand that the A has delivered a severe injury to you. Right now, that injury is a wide open bleeding wound, healing hasn't even begun yet so please hang in there. It will take some time to feel better and your H is going to have to be the "physician" and do the work to help you heal [ this is the analogy Steve Harley uses ].
Some of the things that are going to help you feel safe/heal the injury are:
~ confirming NC via snooping
~ H will need to be O&H and transparent, accounting for all of his time and giving you access to any accounts & records
~ H implement a
written EP plan, approved by you
~ spend 15 + hrs a week UA time with your H, you will both need to learn about lovebusters and how to meet each others ENs (imperative you both read HNHN)
I will come back with a link that has more details on the EPs. Once you have confirmed that NC is truly in place, you can share it with your WH to see how willing he is to implement it.
I have to start trying to rebuild and have be transparent. I've made a list of the things that he will need to do to start gaining my trust again. Show me all e-mail accounts, change cell phone number, show me the statement each month, give me all passwords and so forth.
Correct me if I'm wrong but I think you were using saying you needed to be "transparent" in response to Scotty's advice on surveillance.
You DO NOT need to be transparent. You could make it clear that you will be watching/snooping to make sure you are safe but DO NOT tell your H exactly what you are doing.
Snooping is an important part of recovery as well ~ it will help you feel safer when you don't find anything. I agree with everything Scotty had told you, quietly install keylogger, VAR/GPS in the car. Unfortunately, since your H had a 6 yr affair with an OW who doesn't sound ready to let go, I feel you are going to have to watch your H very closely for a little while here to make sure NC is maintained. Waywards are known for thinking "a little" contact is OK.
Can you tell us more about how your H conducted his A for 6 yrs? When did they communicate? Does your WH spend nights away from you? Details like this will help when formuating an EP plan.