No sex since we're married

My wife and i don't have sex anymore since we're married.

We have a son and since he was born, my wife doesn't want to have sex with me.

I am very respectfull. I love my wife and my son but i am thinking about divorce.

what should I do ? Break up our beautiful family or stay and suffer for my son's well-being?

I have tried everything. The little attentions, the romantic dinners whisper in her ear that I love her but nothing helps...

One important thing, we had our son in assisted reproduction. I think it broke our marriage.