Chemistry with someone else while being in a long term relationship?

Imagine being in a long term relationship. You truly love that person but at some point you have started getting tired of it but not in a level that you want to finish it. Suddenly, you meet someone else that blows your mind. You feel attraction and their is a passion and a chemistry between you two. What would you do? Would you break up with the one that you love and is actually your family? Would you leave everything behind and live the new thing having a distance from the past? Or would you push away the new one and be more focused to fix everything with your partner?

Chemistry with someone else while being in a long term relationship?
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