Expired.
Maybe it is the best word she could ever think to describe what happened between she and her ex.
Expired Love.
Yeah, that's it.
Having no more chemistry she think become one of the reason why their love end up like this.
What she means in relationship there should be something that can keep your heart to feel like 'badump badump' to your lover.
Jealousy and having a quarrel sometimes can either be good or bad for a relationship. But in their case, she think to show that one of them is jealous and try to pick up a quarrel over something small was really needed.
Sometimes she think it's her fault. And she know it's true. She could only think maybe there are plenty of reasons why he got tired of her in the end. And she really regret about it. She can only say sorry but sorry will never be enough.