This is obviously going to be highly dependent on how you feel you will be able to deal with the situation if you stay with your wife. Do you think you can deal with this situation? Can you forgive and forget? Are you prepared to bring up this child? Are you prepared for the other man to be involved?
One of the most important factors in these kinds of decisions is whether the relationship has a chance of lasting if you choose to stay and this is usually dependent on your ability to draw a line in the sand and move on. There is no point in staying with your wife and saying you forgive her if you bring this up all the time; a relationship will likely not last under such strain and it certainly won't be a happy relationship for you or your wife.
On the other hand, if this was a one-off mistake and you feel you're able to not bring the issue up all the time then it is perfectly possible that you can both move on from this and be happy again. It will take a very understanding man to allow the father to play a part in the child's life but this is important and trying to disallow his involvement will probably only make the situation more tense.
I wouldn't rush into any decisions and it is important to think about all eventualities, as it may not be easy to change your mind once you have left. Sit down and discuss your feelings with your wife and come to a conclusion together which you both feel can work. The situation isn't going to change and so I'm afraid it's ultimately a case of forgive and forget or leave and move on.
One of the most important factors in these kinds of decisions is whether the relationship has a chance of lasting if you choose to stay and this is usually dependent on your ability to draw a line in the sand and move on. There is no point in staying with your wife and saying you forgive her if you bring this up all the time; a relationship will likely not last under such strain and it certainly won't be a happy relationship for you or your wife.
On the other hand, if this was a one-off mistake and you feel you're able to not bring the issue up all the time then it is perfectly possible that you can both move on from this and be happy again. It will take a very understanding man to allow the father to play a part in the child's life but this is important and trying to disallow his involvement will probably only make the situation more tense.
I wouldn't rush into any decisions and it is important to think about all eventualities, as it may not be easy to change your mind once you have left. Sit down and discuss your feelings with your wife and come to a conclusion together which you both feel can work. The situation isn't going to change and so I'm afraid it's ultimately a case of forgive and forget or leave and move on.