Jane Austen

Melonie, your second one totally reminds me of Mansfield Park when Fanny nearly marries Henry Crawford- it would have secured her place in society and wealth, but not in love or happiness, and that's a sacrifice of sorts also... one that Charlotte Lucas (P&P) decided to make.

Northanger Abby- Henry Tilney was willing to sacrifice his father's acceptance to marry Catherine.

Also in Persuasion, I feel like Anne Elliot often sacrificed her dignity to bow down to what everyone else wanted from her on a daily basis: her sisters, her father, Lady Russell...