What is the meaning when a man says soon whenever you try to discuss about marriage in your relationship?

So how often has this happened to others when you’ve been dating a man for a while and decide to see where your relationship is going whether you both plan on getting married to someone but when you bring up marriage, all you get from your man as soon and then the relationship slowly starts to end
What is the meaning when a man says soon whenever you try to discuss about marriage in your relationship?
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