Published: 2017-08-08 19:18:26 BdST
The speculation about Neymar's eventual move to France overshadowed the club's pre-season tour of the United States in July and, while his teammates were inundated with questions about the player, the forward made no comment on his future until the move was confirmed last Thursday.
"His way of doing things was not the best, it was not the behaviour we expect of one of our players," Bartomeu said at Barca's annual supporters' congress on Monday.
"We were always clear and we would have liked a bit more clarity from him. Values are very important to us and players need to feel like they are at the best club in the world."
He contrasted the Brazilian's fleeting loyalty with one-club-men Lionel Messi and Andres Iniesta.
"No player is above Barca, everything has a limit and that is why we did what we did. Messi's loyalty should be an example for everyone who wants to wear our colours, as should Iniesta's," said Bartomeu.
The Barca chief said the club had suspected Neymar might leave one day when he agreed a new contract in 2016.
"We predicted Neymar could leave so we raised his buy-out clause to 222 million so we would have a stable future. When we started to doubt he would stay, we remained calm because whatever happened would have been good for Barca," he said.
"If he'd stayed we would have kept an exceptional player, and if he went we'd be able to guarantee we could sign other players."
Bartomeu added that the team would move away from its recent axis of Messi, Neymar and Luis Suarez, the most prolific front three of all time, to focus on building a stronger team overall.
"Now we won't be talking about the Barca of the trident, we'll be focusing more on the team," he said.