obviously these are all in season one, but i know that quinn was cheating on finn with puck, and that was bad (yes), but he got quinn drunk on wine coolers. not only that, quinn literally told him no and he still did it. not only that, when quinn asked him about protection, he lied to her and said yes.
lmao ik a lot of ppl will disagree on this one because it's a headcanon, but she just didn't have ANY chemistry with any of the guys, let alone puck.
keyword: think. she thinks she loves him, she doesn't truly love him.
first of all, shelby fucking corcoran is a creep. sleeping with a student?? idk how she wasn't fired. second, he was saying all that shit to quinn... the call is coming from inside the house sir.
that's all i can think of tbh, even though there's no need for reasons 2-4 because i'm not a weirdo who ships someone with their r*pist.