The Hiring Decision
A vote is not a marriage.
A vote is a hiring decision. It is a choice about who gets public responsibility for a limited time.
Public office is a job. The people asking for it should have to earn trust, answer questions, and show that they can handle power without forgetting who it belongs to.
You can support someone once and question them later. You can vote for a party in one race and refuse that party in another. You can decide that a public official has not earned another term.
That is not betrayal. That is citizenship. Voters are allowed to ask what politicians did with power, whether they earned it, and whether they should keep it.