Hoovering = sucking the life out of you.
Being dumped sucks, but there are times when it can actually be life saving — and that's when the person doing the dumping is a narcissist. When someone with that kind of personality disorder breaks up with you, they're doing you a favor. Hopefully, you'll recover and never have contact with them again.
For awhile, it looks like you're safe from their manipulation, as you've received nothing from them but the silent treatment. It can go on that way for a week, a month and even surprisingly years, and then out of nowhere they reach out and you start to believe there's hope for the two of you to have a real future.
Luckily for you, this will never happen, because you're being hoovered.