Is this wrong or normal ?!

I have a 3 year old son and I'm pregnant with a little girl , but they have different fathers and my sons father is not in the picture at all. And my boyfriend was great and there for him and now all he talks about is getting another job so she can have this and that, and how she will never need anything and so on  (don't get me wrong I'm happy about that but I don't want my son to ever feel left out as he gets older because he already never includes him anymore). It's like he doesn't exist to him. Its making me wonder what kind of man he is ?