Dear Keanu,
does your culture say that being the provider is the main task of the husband? You have filled that part and that cannot be underestimated.
My culture says that the meaning of marriage is to create a close emotional bond and intimacy. That is the best foundation for personal growth for both as well and a safe haven for the children.
It seems that your wife has suffered from loneliness inside your marriage and tried to substitute that with material wealth (from you). It just does not work.
Now that your wife has fallen in love with another man, there is not much you can do about your marriage. She fills her emotional (and sexual) needs from a new source. Sorry to say that. What you can do is to take good care of yourself! Then you can also be a good father.
About your wife I can only say that it is time to let go of her. Her emotional bond with you does not exist any more, which means that the marriage is over.
Though I run this site, it is not mine. It's ours. It's not about me. It's about us. Your stories and your wisdom are just as meaningful as mine. 