Can’t a person change their mind or have a backup plan?

If someone asked you for a favor but also asked someone else just in case, isn’t that normal? Can’t a person change their minds? You don’t have a backup plan?

Like someone is upset because I found someone else to do a favor i asked of him! I changed my mine then he got upset that i did like i was gonna just let him do it.

Favors have backup plans in case one person can’t come through! Isn’t that how it works?
Can’t a person change their mind or have a backup plan?
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