advice please!!!!!

Alexa
Hey y'all. I'm struggling with something. My boyfriend and I are expecting our first child together although he does have a 4 year old from a previous relationship. She calls me her step mom even though we are not married yet and we have an awesome relationship. My issue is that it feels like I'm overly excited about this whole experience and he's not. I know he is excited and he enjoys feeling the baby kick and he takes amazing care of me when my feet or back hurt a little extra. I just feel like as far as social media, talking about the baby, etc., I am WAY more excited and I'm not sure if it's just because I'm super emotional or if it's because he's already been through the whole "pregnancy thing" already. It's causing me some jealousy because I would like for him to be just as excited for our daughter as he was for his daughter from his previous relationship. He used to come to every appointment and he hasn't been to one in months now. He says he gets more excited as it gets closer, which is understandable, but at the same time, I feel like there's quite a few things I'm going through alone. Help?