Should I tell it to her? Am I the other woman?

It's been bothering me for quite some time now. I've explored as much as I can last 20025. And there was this guy, who's a friend of my friend, and we had brief intimate unofficial relationship (around April to May). As far as I know, we were both single. Although I remember he told me "when was your last relationship? Oh sorry I think we shouldn't ask those questions." Anyway, he became kind of demanding (he wants more sx) and when I asked him what if I get pregnant, he told me to abort the child. I blocked him right after that.

Fast forward to early 2026, I totally change my lifestyle. As I was cleaning my socials, I decided to unblock him. I saw that he is already about to get married that time (I think they are married by now) and I don't really feel anything. But then, his profile was suggested to me after few days. So I kinda stalked him and I realized that he and his wife got engaged on first week of July 2025 — that's only two months after us. Now, I wonder if he is really single by the time we had s? Am I the other woman? Should I tell it to his wife or just let them? As of now, I blocked them both to prevent my self from chatting the woman.