Rescheduling
The worst thing a friend or at least someone you think is your friend can say to you is ‘let’s reschedule’. We get it, things happen and life just gets in the way of plans, but if it happens a lot then something is really wrong. No one needs to redo plans that much if they really cared about you.
They would put time aside and respect you more than just cancel your time together constantly. That is a sign that one person in the party is not respecting the other and needs to be talked to and respected at all. If they don’t see your side of the story after that, then let them go.