Hmmm... I'm a little confused. Did they die or did they not die? Was their mind playing tricks on them as their consciousness was slipping away after they died or did that stuff actually happen after they jumped on Valentines day?
I guess they didn't die, he was just having a dream if they DID die that valentines day. He went to the roof to idk, check stuff out and find her there doing the same thing.
I kinda take that as, if you feel like dieing ill die with you but then they both remember they have each other to live for so they keep on living? Kinda wish we found out why she wanted to die.