But we were so in love
Weddings don’t mean to much these days, but love tends to bring out old fashioned, totally idealistic ideas. Despite writing it off, this wedding is the culmination of his passionate love. He transfers his love into this wedding, so it actually means everything to him. Even though it’s a terrible institution in practice, he’s blinded by love to embrace it, seeing it as the only possible option for lovers.
That’s why they went all out for this wedding (only to just break up and have it mean nothing).
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