Spoiler warning: Spoilers for the complete film.
Zyair did not kill his girlfriend, because she is alive, and Ray organized the frame-up. Mea Culpa resolves the prosecution through a family conspiracy rather than a verdict, then lets Mea choose a future separate from the man she defended.
What does Mea discover on vacation?
She sees the supposedly murdered woman working at her resort. That encounter overturns the central fact on which Zyair’s prosecution depends.
The suspicious paintings and his behavior may have made him an unsettling client, but neither can substitute for proving that a murder occurred. The reveal forces Mea to reconsider evidence through which she had already begun judging him.
It also moves the threat closer to home. Her own family’s motives become more relevant than the artist’s ability to make her uncomfortable.
Zyair had slept with Ray’s wife Charlise. Ray combines revenge with political ambition, expecting a successful prosecution and sympathy generated by his mother’s false illness to help his campaign.
When the conspiracy is exposed, Azalia kills Charlise. Mea escapes, then learns Kal has participated in the deception rather than offering the refuge he appears to promise. The resulting crash kills him, and Ray is arrested.
The scheme relies on Mea granting relatives the credibility she is being asked to deny her client. Her personal position has been used against her professional judgment.
Does she reunite with Zyair?
No reunion is shown. After his name is cleared, he messages her with thanks and asks to see her. She throws away her phone and walks on.
Director Tyler Perry interprets the choice as Mea being finished with people for a while. That reading fits the action without requiring a secret promise that she will return to him.
Zyair’s innocence answers a legal question; it does not obligate Mea to maintain their intimacy. Her final exit gives her one decision that is not being made by a family member, a client or the demands of a case. She can accept that the accusation was false and still decline the relationship attached to it.
Sources: official ending breakdown.