A polar bear cub is thought to stay with its mother for as long as 2.5 years after birth. Once the cub attains 2.5 or 3.0 years age it becomes independent.
The female is going to reproduce again in 3 years following the weaning of her first cub. She will then spend the rest of her life with other successive cubs. Female bear can also stay with her mate but mostly likely she’ll spend time with her cubs.
Unlike adult males, the female polar bear rarely lives a solitary lifestyle. Males also become social for a few months during which they look for their partners. Although polar bears generally travel and hunt alone that doesn’t mean they don’t have a social life.
We usually recognize polar bears as solitary creatures precisely due to the fact that they live far apart (unlike we humans do). However, polar bears do not see their world in a way we do. They can just smell their counterparts no matter how far they live.
With its outstanding sense of smell, polar bears likely determine other bears passing through the same habitat than we can imagine. They don’t really need to see each other to interact. However, when they do meet, polar bears display pretty complex, flexible, and dynamic social interactions.