What’s the real definition for not caring if people stay or go being fine alone?

So I’m even shocked surprised in myself about this whenever people just stop talking to me out of the blue or friendship ends I don’t care. I just started to be real with myself couple years ago people will come and go and nobody is your friend. I get over things really quickly now coming from a person who used to want friends badly in my teenage years after 19 I stopped giving a damn I told myself but recent months I really see I don’t. I say this is a really really good thing and I’m happy because I don’t expect much from people at all anymore.

What’s the real definition for not caring if people stay or go being fine alone?
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