Convincingly put it together? Easily. It's about their decision to end their relationship. To me this whole song is about a breakup, and how she doesn't really want it to end, but does it anyway. "The last time that I saw you, this is the end" meaning the last time they saw each other was when they broke it off, when they ended their relationship, when they severed all ties. She misses him, she still thinks about him, and has not been able to get over it.
Convincingly put it together? Easily. It's about their decision to end their relationship. To me this whole song is about a breakup, and how she doesn't really want it to end, but does it anyway. "The last time that I saw you, this is the end" meaning the last time they saw each other was when they broke it off, when they ended their relationship, when they severed all ties. She misses him, she still thinks about him, and has not been able to get over it.