No excuse made for real abusers, but, surely, not having the courage/verbal capacity to tell someone why you are estranging them, makes the estranger the immature one, not the estranged.
Being ‘ghosted’ for an unknown reason, by someone you love, is also a drain on their mental health with their limited time in this earth.
There are numerous reasons for estrangement - and not all of them down to the one that’s been estranged.
Some are just problems that the estranger has.
Mental health issues, addiction, coercive partners, personality disorders - to name but a few.