Unfair

Does anyone else’s significant other does this? I’m 31 weeks pregnant with our first baby and my boyfriend and I are going through a rough patch. He always makes it a point to try to tell me he needs to live his life to the fullest before our son arrives and that he’s stressed about our baby’s arrival. But what he doesn’t realize is I’m the one giving birth in two months, I’m going to be responsible for a human for the first time just as well as he is, and if he would chose to leave I would have no choice but to care for my son on my own.. it just seems like to me that he doesn’t realize that it’s not just his life changing.. mine is too. How can I talk with him about this and what should I say? 😪