Pear tree question

i have a 3 year old pear tree it has never given any fruit in the 3 years since planting.
it flowered last year but no fruit. this year it did not flower, now a lot of the foliage has turned a pinkish colour. dont get me wrong, it looks rather healthy with the green and pink foliage.there is no infestation with fly or any other bugs.the foliage is as clean as a whistle . can anyone throw some light on this problem thank you
music .