You know like how you feel someone getting distant from you and you can't do nothing about it? You just drift apart and you stay there watching, this is exactly what he's describing.I think what he is describing is how the person he once knew, maybe even loved, is a stranger to him now. i dealt wit sum one i loved so much and they were a dick for no reason. i didn't recognize them anymore, i missed the memories and what we had. i think x is saying that the person he fell in loved wit isn't the person he knows now. he can't take this, it hurts. what happened?
This song is pretty much saying people you love or people you're close to can change..

What xxxtentacion meant was she was changing to fast than he could stand and his heart was giving up cuz she had changed too much