cause of all the boys ive been with before

I'm 17 years old. I've fallen in love with a boy named Layton. Little did I know even after my friends warning me against him and telling myself he didn't actually cheat on me because technically we weren't together yet. Atleast that's what I told myself. We moved in together. For financial reasons of course.
Im 19 now and it all ended very badly. And the only way I wanted to cope with it all was to drink, smoke, and have sex with strangers I met on the internet.
This is cause of all the boys I've been with before. All 23 of them. And one of their girlfriends too.