Infidelity Support Group
Any relationship in which one partner engages willfully in sexual relations with another outside of the partnership is considered to have experienced infidelity. This breach of trust is often traumatizing for the faithful partner as well as the relationship, and support is often needed to heal emotionally and to decide whether or not the relationship should continue after...
You're saying that you don't care more about another as you do about yourself. You refer to the death of your unborn child as a "fertility experience". She felt care at that time because you didn't care.
You didn't care enough to acknowledge that your child died. She probably loved that baby as much as she loved your son. Even if it is unreasonable in your mind to imagine loving an unborn as much as a born, just try.
Try to imagine the devastation of losing your son. Dig into your heart to feel that emptiness. Imagine someone referring to it as something so casual like an "offspring misshap".
Your wife deserves better and you know that. Unless and until you're willing to work on your issues of no empathy and self centered behavior, there will be little you can do to help your wife or your marriage.
Find a good counselor and when your ready, get a marriage counselor. If toy are actually invested in saving your marriage.