My boyfriend asked me if I'm cheating on him? What makes a guy ask a question like that?

Anonymous
Okay so me and my boyfriend are in a long distance relationship. We live in two different countries. The last time he visited me was in June, last year. So we were having a video call and he asked "Are you cheating on me?" out of nowhere. I haven't had sex for 9 months with anyone ever since having sex with him last year. I mostly stay at home and rarely go outside. He knows that but did he ask me so because he's suspicious about me? Is it a red flag? More than a year ago, I found out from his internet search history that he had been looking up escorts online in the area he was working. But I didn't even bring up that issue thinking it would ruin our relationship. So I acted like I didn't know about him looking up escorts online. He was also the guy that I lost my virginity to and he was my first kiss too. I originally wanted to wait until marriage to have sex but he promised to marry me so I allowed him to take my virginity.
My boyfriend asked me if I'm cheating on him? What makes a guy ask a question like that?
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