Hi i just had a baby 6 weeks ago and i feel like im doing it all alone my partner wont even pick him up?

unless hes asked to. he did the same with our last baby and didnt bond with him till he was three months either and when we found out that i was pregnant again i imediantly worried that he would feel the same this time he ured me he just wasnt ready last time but this time couldnt wait for the baby to come and start helping to raise him. im feeding so i know h cant help with that but feel like he doesnt even want to help if i ask for help with anything he gets very adjutated with me im on the brink of leaving him because i want someone that wants us and wants to be involved with his family i cant even get in my bath for more than 5 minutes with out him calling because the baby is crying please help i dont want my family to fall apart!!!!!!!!