(NSFW) Why didn't he wear a condom?

I know its my responsibility and that I should have asked. Please do not criticize or bash me, I know. The question is why didnt he? This is the third time I’m ever seeing this guy, and he just slipped it right in. He made sure I came, then he came, he came A LOT, and then I left because I felt a bit disturbed since I didnt know him well.