Obfasculated
You're so stuck on your ex that you're like a stuck pig. They ran because they were scared, and now you're stuck in your head like a broken record that won't stop playing.
'I keep thinking about her every time I see a cute couple.'
'I texted her 5 times in one day. She didn't reply. I'm still waiting.'
'I can't stop thinking about her even when I'm sleeping.'