The Communist-led Partisans liberated the country with little help from the Soviets.
It grated on the Yugoslavs that Moscow patronized them and treated them like a colony to be ordered around.
Things didn’t back to normal until after Stalin’s death.
They got less tense - there were times when war between the Soviet Union and Yugoslavia seemed likely - but the Yugoslavs never became Soviet allies, even after Stalin's death. They never, for example, joined the Warsaw Pact or allowed Soviet troops on their territory.