This is the final chapter…
Santana was on edge the entire day, even though she was dating Puck she avoided him like the plague without being too obvious, but unknown to her he was doing the same thing. Shorter times at lockers, longer times "talking" to Brittany.
It wasn't until cheerios that she noticed what had been weird about that day, (other than not seeing Puck) Quinn had been really nice and acting like she was walking on eggshells around Santana. Then on the rare moment she actually had Puck in her line of sight, the noticed him glance down at Fabray. When she caught Fabray smiling, her heart caught in her throat. That's why Puck was there, he had slept with her! And most importantly she had been wearing that monster's clothes. The she realized another important detail. Puck knew something she never told anyone else about/ He had gotten too close and now it was time to cut ties.
When she served him the credit score paper, she tried not to cry. And he pretended not to care. No one but her knew the real reason and no one but her ever would.
The point of this mostly was the real reason Santana had broken up with Puck. Sorry for never updating.