She just got tired of waiting, was afraid she'd be an old maid and...
5 seconds sound clip from the Gone with the Wind (1939) movie soundboard.
You can hear this line at 02:22:09 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, no, no. I thought surely she had written you.
- I guess she was ashamed to write you. She should be ashamed.
- Oh, how awful to have such a mean sister.
- You must tell me. Don't leave me on tenterhooks.
- Well, she's going to marry one of the county boys next month.
- She just got tired of waiting, was afraid she'd be an old maid and...
- Oh, I'm sorry to be the one to tell you.
- Oh it's cold, and I left my muff at home. Would you mind if I put my hand in your pocket?
- But, Melanie, you don't realize what she's done!
- She's gone and married my Mr. Kennedy!
- He's my beau and she's gone and married him!
[...]