@CalamityJane,
Err, Calamity, do you realise that you can infer from your post: if the man cheats - it's his fault, and if the woman cheats - it's his fault! (?)
Don't get me wrong - I think that we show what is important to us by:
- the time we put into 'it/her/him',
- the effort we put into 'it/her/him', and by
- the thought we put into 'it/her/him'
... and I see many marriages where one of the spouses (and often enough times, both spouses) doesn't give much of any of the three to the other spouse, essentially saying through their actions 'you aren't that important to me'
...and then, after a time of 'not putting in', is eventually left wondering 'where did it all go wrong?
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To the OP, if you are going to stay in the marriage just for the kids, then I would pose the question to you 'What are you going to teach the kids?"
Certainly you'll teach them that they are important to you.
And what about your anger? Will it affect how you behave towards your wife, and for how long will it effect how you behave towards her? Because if it effects you long term, you run the risk of teaching your children:
- how 'not to deal with anger'
- to blow up at the slightest 'provocation'
- to 'twist another persons words around'
- to 'think the worst of someones motives'
- how to be snide
- how to get revenge...etc
None of that may be you - they are just examples of how people who are suffering hurt and anger can react, especially if they can't escape the source of their hurt & anger...and kids learn the most from the most important role models they will have have - you.
As a note regarding what you will teach your children - studies show that social scientists can predict with 90% accuracy which couples will be together in 10 years...by how they fight/argue. So what how you cope with your feelings, and how you behave as a result of them if you stay (ie. if you feel ongoing hurt/anger, how you resolve conflicts)...may (or may not) have a bearing on the success of your childrens future relationships.
Happiness too...is in many ways, a learned 'skill'.
One of the reasons why counselling is so good if you do choose to stay,
Just something to think about.
Best of luck.