you and Harry have been friends for while, casual hookups until it stopped feeling casual you started to gain actual feelings for him so when you saw him with Ginny the way he acted, the way he looked at her as if she had all the answers he needed, so when draco saw you crying over him, he couldn’t help but feel somewhat pity for you and so he decided to hit on you merely just out of spite of Harry until he actually gained real feeling for you, and Hermione tried being supportive but told you it was a bad idea.