Do you think I made a mistake ending the relationship?

I dated this guy from when I was 17 to 18 and we lasted for a year in a half and somewhere along the way I started getting bored and wanted to meet new people. But a part of me still wanted him around because he knew everything about me and we always had a lot of fun together and went to a lot of fun places and he actually moved in with me and my mom and obviously I lost my v to him and that like made our relationship grew stronger but after awhile I just felt like we had nothing to talk about anymore and I actually started questioning if he still wanted to be with me until finally I decided to just break up with him because I didn't want to miss out on other things you know, I mean we were 18. After awhile i started to miss him and actually wanted to talk to him about getting back together but then I found out he was dating my closest friend and she knew everything about us so I was pretty upset but kept it inside because I knew I had no right to be upset. Right? Since I dumped him?anyway they ended up breaking after a few months and I was just too upset and confused about what I wanted and didn't talk to him for awhile and suddenly I got so caught up in people and ended up ignoring all his messages now we've both grown into different people and I barely know who he is anymore and often I think about if I made a mistake or not.