Tree blossom starts to bud then dies back and never flourishes.
Apple Tree Problem
Certified GKH Gardening Expert
It sounds like it may be a pollination problem. If the flower is not pollinated, it dies and does not make fruit. It is becoming an increasing problem with the decline of honey bees. These articles will help you attracting more pollinators to your garden: https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm, https://www.gardeningknowhow.com/garden-how-to/beneficial/creating-a-pollinator-garden.htm