Hope you’re able to control your anger before approaching to him, as we hope there isn't any violence to be seen. Honest opinion, no point finding the guy out to talk. The problem is your wife having affair with another person. Talk to your wife and calmly hear the reasons for her actions. If there’s a need for forgiveness, remember that life becomes easier when you learn to accept an apology you never got. 

Sorry. U mean u r from a divorce parents?

My son now is my main consideration. No matter how miang she is, to be fair she is still doing a good job as a mum but not as a wife.

Some more my son is still small. I afraid it will affect his childhood.

your wife single?

leave them all. live single again. until find another good girl, can start new family all over again. let karma handle whoever did wrong.