he's asking me to do some things that dont feel ok..

hi,i'm 19 year's of age ive been in a relationship with my boyfriend sence i was 16 year's old.
At first everything was fine but then he was asking me to do some things that didint feel ok..
for example he wanted me to talk about my past sexual life with other men or he would ask me how would i feel if he wanted me to have sex with someone else..he's also looked at porn while im in the house ..i mean i don't understand why he can't just be normal
ive been haveing problems in this relationship where i just want to leave him for other reasons but i don't now how to just becouse we just had a baby..thats another situation i just had a baby n i haveint recoverd and he gets mad becouse i dont want to have sex so i gave in n now i dont know if i'm pregnant again my daughter is only a month and 8 day's....please someone give me advice i realy need it..