He was saying that he was no longer married to Lisbon, and then he used that moment to propose to her instead. In the finale, the last big reveal is that Lisbon is pregnant, so the ending is meant to feel happy and complete.

What he meant

  • Jane’s “I’m not married anymore” line was about his ring and his past, not a breakup.
  • He was reframing the ring as a symbol of moving forward, then asking Lisbon to marry him.
  • The final scene confirms they’re headed into a family life together, because Lisbon tells him she’s pregnant.

If you meant the season 5 ending

The result from the episode discussion I found points to the later series finale, not season 5 episode 20 specifically. If you meant the end of Red Velvet Cupcakes in season 5, say so and I can explain that ending directly.