What the heck

My boyfriend and i had sex and he said he pulled out before he came because he wanted to last longer so he let it kind of die off. But then he went soft and couldn't really do it anymore. And he said maybe he did cum. But then his semen would be inside of me . I asked if he wanted me to take a plan b just in case and he said no. I'm wondering if he did it on purpose 🤷🏻‍♀️