Advice 😕?

Is anybody else's SO acting so different since you've been pregnant? I'm 37 weeks, we've been tpgether 4 years, and I feel like I've been doing everything myself. We didn't plan to be in this situation but he's told me he's excited and happy. I've asked him to do little things like grab wipes or diapers when he's out just because we're getting so close, he says he will but never does. He came to me showing me all the new things he bought for himself when he was at the mall and I asked him to pick up my prenatal pills just the day before that and he never did. I've mentioned it to him, all he will say is "sorry" and move on and try to change the subject. The only thing he's bought is the crib which came from someone else so it wasn't expensive. Once a couple weeks ago he talked to me about how he just bought this guitar for $350. After asking him over and over to at least just pick up diapers and him never doing it I got mad and asked what was so hard about doing that when he could drop that much money on a guitar he already got rid of. He said he wasnt going to let "it" get in the way of him doing things he likes to do or getting things he likes to get. Things have just been so up and down since we found out . Has anyone gone through something similar? Does it get better? I'm afraid he lies to me about how "happy" and excited he is and recently I can't see him sticking around.😕