Obfasculated
You're so stuck on your ex that you're like a dog with a bone. They ditched you for fear of getting close, and now you're stuck in a loop of 'what if' and 'why not?'.
'I keep checking her Instagram like it's my job.'
'I texted her 17 times last night. She didn't reply. I'm still waiting.'
'I can't stop imagining us together. It's like I'm stuck in a time warp.'