"I left you"

I read a chat/message or comment (like in Instagram) where T (from last lights dreams) was commenting on his ex's picture or text:
T: I left you
The ex: You left me?
The ex: No you didn't *laugh*
T: *smile*
The ex: *read heart*
T: *light blue small heart*
The ex: *red (or pink?) heart*
T. *Blue (or green?) heart*