Trying not to crash out

We broke up August 29th and Yesterday I was told he had a girlfriend. Mind yall i wasn’t in contact with him for a week because he said he wanted to be friends. So i was like “ok” and we broke up 2 times prior like months ago bc i was 17 and immature but i learned and said no let’s grow together yk? after asking him if he had a gf he said no but hes talking to someone now from his job which broke my heart because he moved on so fast after a 2 year relationship. I blocked him on everything after telling him to delete every single thing involving us. And he just said “ok”, how did he move on so quick. I won’t lie i was toxic and immature at many parts due to his toxicity towards me but I was getting better and wanted him to just grow with me. Maybe he just lost feelings. I’m glad he has someone to love tho.