That's Not Unconditional Love

My husband and I have been married for over a decade. When we met, I was pregnant with my now almost 16 yr old son. His bio dad has never been in the picture, so when my son was four yrs old my husband decided to go to vital records and sign his birth certificate and I've him his last name. My son has no idea that my husband is not his real father. My husband has always been tough on him, but he's our only boy, so I've chalked it up to that. He's always made sure to have food on the table for all of or family, roof over our heads and all those things a father/husband is supposed to do. Over the years though and as my son gets older, my husband always throws it in my face that he has cared for this child that is not even his. That he was left having to take care of someone else's responsibility and that he's dumb for doing it. Today, during a discussion about him owing "our" son some money for some work he had promised to pay him for he refused, knowing that the kid has been trying to save up to buy something for himself. I got upset and told him that we cannot steal from the kid. My husbands response was "he's stolen from me for a lot more and longer". I asked him to explain and he just looked at me at told me that he didn't want to go there because I already know how. He's right, I know what he meant. He considers that my son and I stole his life from him and now he says he's trapped because he can't abandon our girls. Yet, he claims he loves us all.
It hurts so much to know he truly feels this way. After all, if it's consistently came up over the lay 16 years, he really means it. I don't really know the point of this post. Guess just wanted to get it off my chest.