Precisely what happened with me.
I left home at 18, no contact whatsoever with my parents for the first six months. My mother didn't even bother to ask where I was going or who I was going to be with when I announced I was leaving, which just confirmed for me that I shouldn't feel any guilt about completely ignoring her.
I got back in touch purely because I wanted to maintain some sort of relationship with my Father, but despite decades of being civil and making overtures about developing some sort of relationship, my Mother never once admitted to any of her appalling behaviours that drove me away, let alone offered any sort of apology.
My Father passed away, and in the aftermath my Mother returned to being just as vile and unpleasant as she was when I was a teen, so I completely stopped all contact with her. She became ill and passed away, I didn't get in touch despite knowing she was ill because as far as I'm concerned she didn't deserve to be treated with respect and dignity. Didn't know she had passed until the solicitor got in touch. I don't miss her and don't regret my decisions.
As touched upon earlier in the thread, it isn't remotely the case that relatives will always be distraught when a child more or less vanishes off the face of the earth. My own Mother evidently didn't care one jot. Not only that, but many of the very people responsible for children electing to "disappear" will be incapable of grasping that they themselves are the sole reason their child has taken that decision.
Something similar happened with my sibling, the golden child, and my Mother wailed "poor me!" non stop for years. Just didn't occur to her what the common thread was at all.