Boyfriend forgot miscarriage due date

So I had a miscarriage a few years ago and a few days ago it would have been their 2nd ‘birthday’. I was hoping so badly that he’d remember and that we could do something like we did the first year (my suggestion).. We argue quite a lot and I feel a lot of anger towards him for it for some reason as he didn’t take it seriously that it was happening at the time, I went to the hospital alone and he never came to visit after it. I feel so hurt by it all still and he acts asif it never happened, we argue when I tell him how I feel.. he knows how upset I get and how I love talking about it but he knows I don’t like to talk to him about it because I get the impression he isn’t bothered so I make hints for him to talk to me but he never does. So I said to him can you believe we would have had a 2 year old today and he said oh yeah crazy and then totally changed the subject and didn’t say any more about it. This has really upset me and I just can’t tell him. I’m feeling so angry towards him now for it, I just don’t know whether I’m over reacting or not.. he just acts asif it never happened and that he’s fine with it but he knows how much it means to me to keep remembering it and talk about it.. I just don’t know what to do. It’s really affecting the relationship, I want to have sex with him but then when we do I feel no connection and it feels so forced. I just don’t feel happy but can’t imagine being without him!!