My girlfriend thought I broke up with her and she hooked up with one of my best friends. She was trying to make up her mind and I didn't know what to do because she hasn't texted me in days.

Define hooked up, and how old are you both? What does your best friend say? Why would you want a female who "hooked up" with anyone because of what she thought you meant?

What happened here?

Got together. We are 13. I didn't tell my best friend there was a stick-up because if I did and she chose me over him, he wouldn't respect me anymore. What comes first, your chick or your bro? You know?

Forget the texts, can you talk to her at school, face to face, and clear things up, one way or another?

Yah but over the weekend we can't talk face to face. Unless we are going out. I only have 1 class with her and the teacher is really really strict. I really like this girl but I don't know if I just let her go because she was with my best friend before she was with me, and I know I could do better anyway.

So she just went back to him? Don't sweat it, there are many more better for you.