What can I do

So I’ve been with my boyfriend for 4 years and we have a 2 year old son together and I’m pregnant again with our second☺️I don’t know why but I just can’t seem to make him happy! He’s always upset always thinking about something and he never shows any love it’s like he has no feelings😑 we have had our ups and downs but I am literally sick of arguing to the point when he says something that would usually wind me up I don’t respond and just smile. I love him so much and want us to be happy but it seems like I’m digging in water😴 I want him to stick up for his family and do what’s best for us! Every time I talk to him he just says I’m tired rn we will talk about it another time I’m lost literally😤