Bipolar man...

I have a very bipolar boyfriend who thinks the baby isn't his then other times he KNOWS it's his because I haven't been with anyone else and the dates match. One minute he's like "our boy" then he's like "your son". He will text during the day and ask how 'his' junior is doing which is lovely and then say he doesn't care about me etc. Will all this change after I give birth? Will he look that baby in the face and feel some sort of love/connection. I'm not about to be stressed over this dude 🙄
Does a man change seeing his baby being delivered or after birth in hospital? When is it real for a man?