To be in love meant to be a slave to an ideal, surrendering one’s rational mind to an alluring concept that could potentially border on obsession. Draco had long given up sycophantic devotion to ideals of any kind.
To love meant a choice. One he’d not made before Hermione. She ought to know that for Draco, loving her was a conscious decision, deliberately made.
Not in love. He loved. He loved her