Sorry you have and are struggling with binging and purging
I know exactly what you mean when you say it becomes too 'natural'.
For me it's been when the moment I start to feel full, my first reaction is "I need to purge!" even if everything I ate was low calorie and healthy. It's when I eat one small thing unhealthy (nothing outrageous, not even a binge), and my reaction is to purge.
It's when it happens no matter where I'm at, whether it be work, and I try to find a way, or whether I'm visiting my parents and make a far fetched excuse to book it home to purge.
Even more so when it becomes part of a 'daily routine'.
It's really crazy when you realize that it's to that point, and you have to wonder how you ever got there.
Anyway, I hope you don't let this take over you and let it stand in the way.
I hope things start looking up for you