'oh, well' is an interjection that means 'i could not care less.'

Used when something is mildly disappointing, but not enough to obsess about.

Not caring about something.

Something that is upsetting but you just have to deal with it

Used when someone doesn't care, often when they're in a down sort of mood.

Used when you don't know if it's the end of the conversation or if it is the end of a conversation but you don't want things to seem awkward

Showing not much interest towards a situation or event that has happened or may happen.