Re: Wife is choosing other man
Here is the deal you should never be dependent on anyone for your complete happiness or better yet contentment. Let them add to it but don't be dependent on them. That is the lesson. You are responsible for you. That gives you options and makes you strong and confident. It enables you to be authentic because you can say yes and no without fear. Authentic confident people are attractive.
Reading these threads you can pretty much tell the codependent ones from how many replies they have in their posts about being cheated on. If it is a very long thread inevitably the person who started it is very codependent. This is not a coincidence. That's not to say they are in anyway responsible for the cheating their spouse did but it is to say this is a pattern and seems to be a magnetism that draws the two types of people together. (In this case though I don't think this is you OP, but I DO think you missed the signs with your ex who is very shallow and needy. The only thing that holds relationships together when it's hard is character, both partners need to have it, she didn't.)
Continuing on the theory of your ex it's very unfair and unhealthy to expect someone to bring you life long contentment. The only person who deserves that responsibility is you to yourself. In this case this is what your wife expected of you. She was the one who was not authentic. She was the one who was codependent. Because of that when you got busy with life doing what normal people do (growing a business), instead of having the character to deal or even just say, hey I need more from you, she just moved on to the next person who temporally made her feel whole.
Finally all that said, some people are just not meant to be in long term relationships and some long term relationships are not meant to last. Again not being dependent enables you to be in a much stronger position if they don't work out. It's OK for things to end. Life will go on, you will be happy again. That's life.