Not sure what you mean by took off all the blossom. You may have removed the fruiting buds which is where the blossom froms and the fruit is produced from.
When you prune an apple you prune it for shape but also to produce fruiting buds.
I am guessing that you have removed these fruiting buds and therefore there is nothing to produce blossom.
Instead for removing the blossom, and I suspect the fruiting buds, another option would have been to allow small fruit to form the remove these by cutting at the stalk. Still as they say hindsight is a great thing.