It actually doesn't come across as the mistakes building up. It sort of starts with the big one. Which isn't all that big. It could have been much worse. Leaving a pot on the fire, burning part of the house down.... now those are like wow what were you doing? Not paying one bill? Eh. Worth getting thrown out? Not such a big deal from my perspective... note from my perspective, lol.
Also, until he mentions it, I don't see where he feels he was taken for granted in the relationship, and even that was emotional. Again, this is what I got from it.