It was very sweet… until Governor Pryce ordered her men to fire on the containers, blowing up the fuel inside.
He was ultimately successful in rescuing Hera (and her Kalikori), although he lost his lightsaber to Rukh.
Arguably the final nail in the figurative coffin for Kanan came when Hera confessed her love and kissed him on top of one of the fuel pods at the TIE Defender factory just as Ezra and Sabine flew in to save the day.
On a more serious note, Kanan was playing things close to the chest, and he got a special final moment with each Ezra, Zeb, and Sabine before setting out on his mission to rescue Hera.