Sharing Our Innermost Thoughts

So I have been very close with my ex’s cousins and friends. I’ve been sick for a long time and had to drop college for sometime because of that. So I was usually alone in the town while all of my friends went out of town for college. One time one of his cousin came back for summer holidays and called me one evening to ask if we can hang out and I thought that was very sweet of him to invite me over. At around 7pm we went out for movie along with two of his friends. It was almost midnight and we were heading back home, he dropped off his friends first and then when both of us were alone in the car he asked me if he could hold my hand and I straightaway said “NO!” I was freaking out and then he went on to confess how he always was jealous of his cousin (My ex) because he had a girlfriend like me and how he was internally screaming with joy when we broke up. And that was so freaking awkward, and he even went on to say “what does he have that I do not?” to which I replied “He has morals”, I went on about how disgusting it is that he’s hitting on his cousin’s ex while I always treated him as family and what makes it even worst is he already has a girlfriend of his own. The entire way he nagged about how his girlfriend was childish etc and I stayed silent the entire way just wanting to get back home safe. When I got off I told him to never contact me again and to go back home and have a good look in the mirror. I instantly unfollowed him and removed him from my followers list and now few years later he sends me a follow request on ig again?
I felt really bad about saying mean things about his looks but at that moment that was the best I could do or speak. It was really disgusting because my ex really adored him and so did I and he has no idea what his beloved brother did behind his back. This incident just made it even harder for me to trust people.