How likely is my (17f) relationship with my boyfriend (18m) to last?

We just celebrated 13 months together. We were going through a bit of a rough patch in November/December which ended in us breaking up for a little less than 24 hours before we talked it out and I gave him another chance to think things through. We’ve been happy up until November and have been relatively happy after then. But I can’t help that in the back of my mind there’s the thought that if I make one mistake he’ll break up with me again. Are we kind of just doomed? I want to work it out but I don’t know if I can get over that feeling.

Also if you would like more details just ask

Tl;dr my boyfriend broke up with me and we got back together but I can’t shake the fear of it happening again