
I think she means that you know something is good for you, but you do not make the effort to do it and thus cheat yourself. I believe with me it happens all the time. I believe life is basically about learning how not to 'cheat' yourself by giving you all the things you deserve. a good example of this is what we eat. We can eat really good foods and give ourself health, but we often cheat our bodies by feeding our taste buds instead.
If you feel screwed up later, then you passed the thin line I often passed in my life: The line when you help without taking care of yourself.
I think now that I am 36, I start to recognize this line earlier and learn to say NO!.
But maybe cheat yourself can be also, when you hope and dream something will come true and even you realize it will not: you don't want to accept it!
It happened to me in my marriage, I did knew it was about to end but first I didn't want to accept it. You could say I cheated myself thinking a miracle would happen and we could become a happy family.
I needed to open my eyes and see that we both changed and lost our love.
Then it happened again.
I hoped my boyfriend would decide he wants to have a long lasting relationship. Even we both agreed not to have one, I did fall in love and started to hope we could.
And despite all the hints he gave me, for example telling me plans of the future I wasn't included, I hoped!
Means, I cheated myself.
Maybe I will learn not to do that to!