Quinn was so jealous of seeing Finn and Rachel together, people could see that and everyone thought that she wanted Finn for herself, but they didn't know that Quinn was bisexual and all she wanted was Berry.
Two years ago, Finn left Quinn for Rachel after she cheated on him with Puck and life is repeating itself: Rachel slept with Puck and Finn found out about that and decided that he doesn't want Rachel anymore.. He told her that everything about her reminded him of Quinn, like if Quinn was someone bad, she was drunk and Puck tricked her into his bed but it wasn't the case with Rachel who was completely sober and did that to prove to herself that she can get anyone.
Quinn knew that Rachel was drama queen and she hated loving her, she was the one who stole her boyfriend after all, but Quinn believed that we can't choose the one we love.
Yes.. It wasn't just a crush, Quinn Fabray was madly in love with Rachel Berry, it all started when Rachel wanted that nose job and Quinn saw the pretty person Rachel was and she was so happy that Rachel changed her mind and kept her nose. Quinn walked slowly into the piano's room as soon as she heard Rachel playing a sad sonata. "Hi Rachel, I heard about you and Finn, I am sorry about that" "You don't sound sorry Quinn, it's okay , you don't have to lie to make me feel better" "Fine I am not sorry" "Quinn, it happened two years ago and you moved on with Puck and Sam, why do you still hate me for that?" "I don't hate you Rachel, believe me , I want to hate you but I can't" "What's the trick Quinn?" "There is no trick" "Are you sure?" "Positive" "So .. You don't hate me, but you're happy to see me away from my boyfriend?" "I didn't say I was happy " "But you are" "Smart girl" "Well I am not that smart if I can't get it" "Well, I don't like Finn anymore, I .. err .. Love you" "Err .. Thanks" "No you don't get it .. I love you .. Love love .. Like a girlfriend , a wife , a lover .. " "Well , that explains a lot " "I confess my love to you and all you have to say is that?" "Quinn .." "It's okay Rachel .. It's my fault, You are Rachel Berry , you love yourself more than anyone , why would you say you love me back , ah I am so stupid" "Quinn! Listen to me !" " Yea ?" "Finn and I lied about the whole fight , he left me because he thinks that I love you , I scream your name while we was having sex , Puck had no problem saying that he slept with me to everyone in the glee club , he wants to be known as the boy who can get every girl as you know , Finn said that I remind him of you because he feels like you're part of our relation , you're always there , you're everywhere , and even when you're not , I scream your name in pleasure , I keep my eyes open when I kiss Finn because I am always scared to say the wrong name , so yea Quinn here I am saying it back .. I love you too" "Wow Rachel , why didn't you tell me ?" "I was scared " "well don't be" "I love you Quinn " "I love you too Rachel"