I miss him and hate him sm

A few months ago, I started chatting with a guy, around 20 years old, who had sent me a random friend request on sc. Even after I told him I was a minor, he kept msg me, claiming he just wanted to be friends. Idk why I believed him, but we became friends. However, he started acting really strangely, flirting but in a way that seemed to test my boundaries. I knew it was wrong, but I was in a vulnerable place, dealing with a lot of other issues. it was as if my judgment was clouded and, for the first time, I felt truly seen. Later, he asked for photos and voice notes (nothing NSFW), and I agreed just to get more of his attention, plus, I felt pressured because he had already shared his own. Things got worse from there, he even told me that if it weren't for my age, we’d be sexting. Honestly, I knew what I was getting into, but I ignored the red flags because I just wanted someone to treat me that way. Then, after a few days of talking about his job and studies, I was absolutely horrified when he mentioned working or studying (I don't recall which) in the military. He also mentioned getting a part-time job at a hospital, where he said he’d get turned on watching vulnerable women giving birth. That was the moment I realized I wasn't just dealing with some random creep, but someone with serious qualifications who was going to be working in a hospital and the military, saying things like that to me. That’s when I finally came to my senses. I told him he was an idiot for taking advantage of the fact that I "needed" him, and I blocked him. I kind of forgot about it after that, but a few weeks ago, I happened to check his profile just for fun and saw someone else's initial next to a heart in his bio. I don't know if it was just because it was so late at night or what, but seeing that absolutely crushed me. I can't stand the fact that he's now with a girl his own age, someone he can be with openly, and that she probably doesn't even know about the disgusting things he said to me. I try to get over it, and I think I am, but sometimes I still wonder, what would have happened if I’d just turned a blind eye and hadn't blocked him????