Petry,
I am sorry that you find yourself in this position. Please listen to the advice of the folks here as there is a lot of collective experience to draw on. I am a newbie, and a BH.
My WW began her affairing when were married just over 2 years. At that time we did not have kids. When we were married almost 5 years we almost got a D. I didn't know about the affairing then. As we discussed this history, I asked her why didn't you just divorce me when this started? Then when we were on the brink of D, why didn't you tell me about the A? We didn;t have kids and I would not have wooed her if I knew about the A. Now we have two kids and I need to know that I did everything I was capable of to make sure they have a happy and safe home. I am working on that home include their mother. I think about D a lot though. A lot. I wish I knew that she had my best interests in mind. I wish I didn't have to look at every single thing in my home and think, about how her affairing colored the decisions that we made as a "married" couple.
My point in telling you this is that without kids, entangled finances and all the complications that come with those, you have the opportunity to learn from this mistake and start fresh. Wayward spouses are crafty and they do not abide the same values that humans do. So you will end up always doubting, always double checking always snooping to protect yourself. It is an exhausting way to live, spare yourself that pain.
Don't snap to a judgement though, maybe it would be a good idea to buy
Surviving an Affair
Lovebusters
His Needs Her Needs
Read these titles and see if the concepts make sense to you. If they do discuss them with your WH and then if he professes to agree, observe how he follows through. does he give lip service and try to manipulate you by telling you that you are too controlling or does he build the habits that you both need for a successful marriage.
Please whatever you decide to do, get educated and do not repeat the mistakes that so many of here have. the concepts in these books will help you build you marriage with your current H or with a new one. You do not deserve the treatment that you are currently getting and if you are getting it now, what can you expect when the shine or newness is off?