Sounds like your xdp is offering to take you on a guilt trip... glad to hear you have other plans.
Have fun tonight with your friends, but today call centrelink, CSA and legal aid as when the csa assessment comes in and his drinking money is slugged, you may need it.
:hug: Next week, find someone to watch your son and another person to be your support partner for the birth of your baby. Focus your energy on you and your babies and what you need to do. With every thing you achieve without him, the more confident you will feel in your own abilities.