trying not to get pregnant

My baby's 2 months old. And i'm not trying to get pragbant again. My husband kept inviting me to have sex with him. I really want to but i had to refuse him twice and kept telling him "you should buy condom first before we can have sex" and he said "let's do withrawal. Trust me" but i kept saying no and he said "you don't have trust in me" and i felt so guilty. He said he wants to freely feel me without using condom. What should i do? Giving birth is so painful. And taking care if the baby is a real struggle and i like to explore more our marriage and to have fun first before having lots of responsibilities.