Most responsible fruitarians don't recommend a lot of juicing, but to eat fruits and veggies in their whole form because the fiber in them helps prevent blood Sugar from getting too high. You admit you were overdosing on apple juice, so it wouldn't be fair to say it was the fruitarian diet.
A fruitarian diet has always included overt fats, like avocados, nuts, and seeds. Any foods that falls from a tree basically. The difference is that in nature, nuts and seeds are usually in shells and are very time consuming to pick, crack open and eat, so a diet in nature is pretty low in fat. Even wild game is low in fat. It's only when we took animals out of nature, put them in bins where we fed them unnatural foods and they didn't have to run from predators did their body fat greatly increase.