in the great gatsby Myrtle Wilson says that her husband is not the man she thought she married. What happened right after their wedding that caused her to immediately think she's made a mistake in marrying George Wilson?

As per Great Gatsby Novel, it states that: "He borrowed somebody's best suit to get married in and never even told me about it, and the man came after it one day when he was out."

She had high hopes of marrying someone with social and financial status.