I only stay with my wife because I love my boy so much
What is wrong with your wife?
She is boring. She spends a lot of time and dedication on my boy, though, and I couldn't bear to take him from her.
That makes sense. But your son might feel worse if he knew you didn't want to stay with his mother because you love her. It's better not to stay together just for your kids.
I just want my boy to be happy I don't care about anything else./
I understand how you feel, but I don't think that's the right choice. It might be better for all of you if you didn't stay with your wife only for your son. He might be happier knowing that both of his parents are happy, even if they aren't together.