Started googling the Psychology. Only 2 things stuck out to me that put me back on 'not giving a fuck'.

1) EVERYONE feels lonely. Relationship or no, it's NORMAL (This is why your blue pilled friends try to 3rd wheel you).

2) Instead of worrying about who isn't there for you, try being there for your friends and family. It releases even more of the needed dopamine/serotonin. Take care of your brothers, brothers.

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This may be common knowledge. Just thought I'd share.