Any speculation as to why they may have rushed marriage (read description to understand the question?

Man and woman are friends for around five years before deciding to go on a date, previous to which the woman was dating someone else, and broke up just months prior to her date with the new guy. Man and woman date for less than a year before exchanging their wedding vows a year later – it is not known why the two somewhat rushed to marry.
Any speculation as to why they may have rushed marriage (read description to understand the question?
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