Until clause (...but I decided not to buy anything until I had disembarked.)

[Iwanna]

Here is the context:

Small boats loaded with wares sped to the great liner as she was entering the harbour. Before she had anchored, the men from the boats had climbed on board and the decks were soon covered with colourful rugs from Persia, silks from India, copper coffee pots, and beautiful handmade silverware. It was difficult not to be tempted. Many of the tourists on board had begun bargaining with the tradesmen, but I decided not to buy anything until I had disembarked.

I had no sooner got off the ship than I was assailed by a man who wanted to sell me...

——In the end of this story, the author still bought something before coming back to the ship. My question is, what is the exact meaning of the highlighted sentence: 1) I did not want to buy anything on board. 2) I was determined not to buy anything throughout the stop, but I changed my mind after I disembarked(failing to resist the temptation).

[Mister Micawber]

.
I decided not to buy from the small boats but from some shop onshore.
.
_________________
Native English teacher at Mister Micawber's