The tumult of her mind, was now painfully great. She knew not how to support herself, and from actual weakness sat down and cried for half-an-hour. Her astonishment, as she reflected on what had passed, was increased by every review of it. That she should receive an offer of marriage from Mr. Darcy! That he should have been in love with her for so many months! So much in love as to wish to marry her in spite of all the objections which had made him prevent his friend’s marrying her sister, and which must appear at least with equal force in his own case – was almost incredible! It was gratifying to have inspired unconsciously so strong an affection. But his pride, his abominable pride – his shameless avowal of what he had done with respect to Jane – his unpardonable assurance in acknowledging, though he could not justify it, and the unfeeling manner in which he had mentioned Mr. Wickham, his cruelty towards whom he had not attempted to deny, soon overcame the pity which the consideration of his attachment had for a moment excited.

– Jane Austen

Pride and Prejudice, Chapter 34. This passage gives us an insight into Elizabeth’s complex feelings towards Darcy. She sits and cries for half an hour. She is confused and astonished that he should make her an offer of marriage and declare that he has been in love with her for months. She admits that she is "gratified" to have "unconsciously" inspired such affection in him. She finds it "almost incredible" that he overcame the social barriers between them to propose marriage. She has "pity" for him because of his feelings. But she is also horrified by his pride and what what she thinks is his cruelty to Jane and Wickham. This passage suggests that the affection between Darcy and Elizabeth may not be all one-sided, but shared by her also, although she may not yet know or admit it.