Would you call off your engagement if you found somebody you think you like more?

Let's say you share common values with the person that you're with you've been together for a long time and finally decided to get engaged because you're getting older and you want to get married and have a family eventually. Suddenly someone pops into your life that you're very attracted to and also shares common values with you and you feel you might be more attracted to them then your current partner. Would you risk ending that relationship, calling off an engagement to pursue a new relationship with someone else even if you're not completely certain that the relationship with the new person will be long-term?
Yes
No
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Would you call off your engagement if you found somebody you think you like more?
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