Relationships in High School - What Are the Most Common Reasons to Break Up?

All my relationships were alike, three months or less. And even when people fight in a relationship, i feel lik it's rare to see them fight and the like work it out,. Then they're in a normal relationship again. I was recently talking with one of my best friends from high school, and we were kind of looking through her and i's old chats together. The most common would just be, like, you feel like you don't like them any more. Or maybe even someone starts to like someone else.