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These articles may help: https://www.gardeningknowhow.com/ornamental/trees/tgen/repairing-tree-bark-damage.htm, https://www.gardeningknowhow.com/plant-problems/pests/how-to-keep-rabbits-out-of-gardens.htm

Actually, it sounds like you have a pollination problem. It is getting more common now that honeybees are in peril. The trees will abort any fruit that come from flowers that are not properly pollinated. You need to take steps to attract pollinators to your yard. The branch growth is normal, but needs to be brought into check through pruning to keep the trees fruiting. Here is some information that may help you:
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
https://extension.psu.edu/plants/gardening/fphg/pome/pruning/pruning-a-special-case-renovating-old-fruit-trees

It should be fine as long as you have pollinators. Helping to attract pollinators is your best bet for a well performing fruit tree. This article will give you some tips on how to attract them: https://www.gardeningknowhow.com/garden-how-to/beneficial/creating-a-pollinator-garden.htm

If it is completly broken, you will not be able to repair it and even if it is more than 25% severed, it likely would not be able to be healed. The tree may survive if there are branch buds below the break but the tree will grow forked and low, almost looking bush like. Some orchards intentionally do this to their trees to make harvesting easier, so it is not necessarily a bad thing.

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

If it is young, you may be able to get it to lean the other way or dig it up and turn it. But, if it is causing issues on the path, then I suspect it is not young. Once a tree is beyond a few years old, moving it will most likely kill it. There are professionals that can be hired to do it and increase the chances of the tree's survival, but there is always a chance the tree will still die.