1. When you cannot stop thinking about the person that left you.
2. When you are still in love with someone that treated you wrong
3. When you cannot move on; you miss the person continually.
(Not refering to the death of a family member, specifically talking about when a relationship is over and you still in love.)
" I miss him so much, why did he do me like that, I still love him, no matter what. I hate this love hangover. I wish that I could move on without missing him all the time, but I can't help it. I'm still in love.."