What Can I Do To Marry His Brother?

I am 22years old girl and am through with high school, In a month time, I will be getting married.

 Last 2 months, my boyfriend took me to see his brother who just arrived from America. And I kind of like him and I believe he likes me to. 
He even invited me to a party without my boyfriend knowing..

Now I love the brother more than my boyfriend. 
Even I want to marry the brother who is richer and also wants to take me to America for a Holiday.

Furthermore, the brother is stronger in bed than my boyfriend.
What can I do to marry his brother without hurting my boyfriend.

Please advice me

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