My fiancée wants a dream wedding I can't afford

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We are due to marry in December and have been having wedding committee meetings to organize the wedding. My fiancé is putting too much pressure on everybody so that she can have the wedding of her dreams. We are both not financially stable, but this has not stopped her from fronting unusual expensive proposals even when cheaper options are available. She says our friends and family will contribute, even so the amount required from them will be enormous. I want to make her happy on that day, but I am pushed to the wall. The budget so far is sh.560, 000 and when I suggest cheaper options she threatens to boycott the wedding saying it’s her wedding, she will have it the way she wants .I don’t know what to do and I’m already contemplating quitting. Please help