immortality is fun, you get to do things at your own pace and you get to take as much time to succeed as you need without the fear of knowing you have an expiration date.

until, of course.. you're at your best friends funeral for multiple lifetimes. So.. Mach has just given up. She's not doing this anymore. If everyone she loves is going to die then why befriend them?

then you came along. You were the first person to break that shell in this lifetime besides that caterpillar person, Pilby.. but sadly, she was couldn't be very happy knowing both you and Pilby are gonna die one day.