This happened in 5th grade. me and this dude named nicol(not his real name ofc) We became bestie and so was our mothers. We helped each other with hw and stuff, and with studying. so I also had other friend nia, so she spread a rumour that we were dating and he had a crush on me(this before I had feelings for him) so me and nia used argue about this. After a week, me and nia stopped talking, and I was crushing on nicol. He hurt me and he didn't even realise it. I never told him, but he got super close with nia and everyone started hating me, and he ignoring me. It hurt me a lot. me and nicol live in the same neighborhood and whenever I seem from my window, I just get mad. We don't talk anymore...
(Side note, he switched schools after 5th grade cause his mum thought that the school that I go to wasn't good. It's an ok school. the one that I go to)
