What does "he lives on a landslide" mean in the Chorus?


[Verse 1]
I'm twenty-one
The edge is razor thin
Between being numb and feeling everything
Good days only serve as relief again

[Pre-Chorus]
Now I'm watching as I waste away my days
And then
It's a cross dissolve
It's a scene I've played before
And the leading role that I thought I'd hold
Doesn't listen to me anymore

[Chorus]
But I'm wearing his boxers, I'm being a good wife
We won't be together, but maybe the next life
I need him like watеr, he lives on a landslide
I cry in his bathroom, hе turns off the big light
I'm being a cool girl, I'm keeping it so tight
I carry him home while my friends have a good night
I need him like water, he thinks that I'm alright
I'm not feeling human, I think he's a good guy