Why did Zelda break off the engagement?

Why did Zelda break off the engagement? For a year, Scott struggled unsuccessfully to make his fortune in the advertising business, but Zelda grew tired of waiting. When he professed that he could not be successful without her by his side and proposed, she broke the engagement because she felt too much pressure.

For a year, Scott struggled unsuccessfully to make his fortune in the advertising business, but Zelda grew tired of waiting. When he professed that he could not be successful without her by his side and proposed, she broke the engagement because she felt too much pressure.
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