It's wrong to make plans and then break them.
Jane agrees to meet her friend for lunch on Saturday afternoon, then has a date with her boyfriend on Sunday.
Jane wants to get her hair done before her date on Sunday.
Jane makes a salon appointment for Saturday morning, so she can make to to lunch with her friend as planned.
Jane cancels her plans with her friend and makes a salon appointment for Saturday afternoon.
Jane and her friend become closer by spending time together.
Jane's friend is upset and resents Jane.