How can I get my fiancé to leave me?

I'm very unhappy in my relationship I'm only 20 and engaged but I just had a huge revelation that I'm missing out on so much in life by being tied down this young. I don't wanna be the one to end the relationship so im asking for advice on how to get him to break up with me without cheating?
How can I get my fiancé to leave me?
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