In the season 5 finale, "Angels and Devils", Charlie proposes to Amita at the end of the episode after she had been kidnapped at gunpoint in front of him by the leader of a cult. After Don and the rest of team get her home safely, Charlie proposes to her saying that he has learned this past year (5th season) that life turns on a dime and he doesn't want the things that matter (Amita) to disappear because he waited to see what could happen.
In the season 5 finale, "Angels and Devils", Charlie proposes to Amita at the end of the episode after she had been abducted by force in front of him by the leader of a cult. After Don and the rest of team got her home safely, Charlie proposed to her stating that he has learned this past year (5th season) that life can change suddenly and he doesn't want the things that truly matter (Amita) to vanish because he waited to see what could happen.