Jack-In-A-Box
When an ex shows up everywhere you go. They won't leave you alone. If you don't stop them, they'll turn into a stalker or a psycho.
My ex Jack-in-a-Box me at the store. She showed up like she was following me.
He saw his ex Jack-in-a-Box him at the park. She was crazy.
She showed up at my favorite movie theater. She was Jack-in-a-Boxing me.