Here’s a clear summary of why Kay Adams leaves Michael in The Godfather Part II and how she testifies (or rather, what she says in confrontation):
Why Kay Leaves Michael
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Kay becomes increasingly alienated by Michael’s criminal life—his involvement in violence, his secrecy, and how his “button men” hang around their children. She comes to believe Michael will always live in a world defined by crime and mafia traditions.
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She can’t tolerate being part of that world anymore, especially fearing another child being brought into it. When she believes she is pregnant, she chooses to have an abortion rather than give birth to another Corleone “son” who would be pulled into that life.
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The trigger for her decision comes in the wake of Michael’s public testimony to a U.S. Senate committee. Although the committee is investigating organized crime, Michael testifies, Pentangeli is ready to press charges, etc.—but ultimately no substantial change happens. During this period, Kay resolves she must leave to protect herself and the children.
How Kay “Testifies” or Confronts Michael
Kay doesn’t testify under oath in a courtroom, but confronts Michael powerfully during a tense private meeting:
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She goes to see Michael in Washington (at the hotel with the Senate committee hearings underway), bringing the children with her to say goodbye. She tells him she’s leaving him and taking the kids.
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She reveals that what Michael and everyone else believed to be a miscarriage was in fact an abortion. She says the reason was moral: she refused to bring another of his sons into his world (i.e. the violent, criminal legacy).
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Michael reacts with rage—he strikes her in response, declares she will never take his children, and effectively severs their relationship, taking custody.
If you want, I can also share how this scene ties into Michael’s arc or how it affects their children in later films.
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