Dialogue is what people do, not what they explain

If a character is saying what you need the reader to know, the reader can hear the author clearing their throat. People do not explain their backstories to friends who were there. They dodge, boast, change the subject, and answer the question beside the one they were asked.

Read the line aloud. Not in a special reading voice — in the voice of someone who has somewhere else to be. If you run out of breath, or if you would never say it across a table, the line is still an essay. Cut it until a person could survive saying it.

Give each speaker a different way of wanting the conversation to end. One wants forgiveness. One wants the other person to leave before the kettle boils. The scene moves when those wants collide. If both people are cooperating with the author's message, you have a press release.

Exposition can ride inside a fight more easily than inside a speech. 'You always do this, like you did with the lease' carries a fact and a grievance. The fact is remembered because the grievance hurts. Facts delivered calmly, for the reader's benefit, slide off the page.

Keep a line only if it does something: reveals a lie, costs the speaker, changes what the other person will do next. Pretty lines that do none of those are the ones you will be proud of and should suspect.