Am I over reacting?

Me and my partner are ttc for 2 years and I've just found out I've pcos and have to get rid of weight before any treatment (I knew I would have it's not a problem) he said to me "oh if we can't have our own baby at least we've always gotten my son" and "if I didn't have any more children I wouldn't actually care because I have my son" like fair enough but I want a baby of my own, I want to experience it all myself! He even went as far as to say that his son will always be loved more because he's first born and their bond will be stronger (he only knew he had this child when he was 1.5 and he said to me that the bond and love wasn't there to start with?" I know I'm probably just angry and over reacting but I just think it's selfish and inconsiderate