What will happen if we leave someone? what will they going to feel?​

it depends upon their present feelings about you

if you're really someone much important for the other one, they're gonna feel much broken...they won't even feel as if they have energy, their mood and all will be all screwed up... checkout the song blue and grey by bts and you'll understand

and, if you're someone not much important, it won't really change much i guess

usually when someone leaves someone they feel depressed, lonely and unloved. Sometimes people may feel suicidal too, because they may believe they can't live without someone.

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