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Sounds like your tree may be infected by peach tree borers, which also affect apricot trees. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-borer.htm

Also, you don't need a male tree. Apricots can self pollinate, though having more than one tree does increase its chances for fruiting. This article will help with non-fruiting issues: https://www.gardeningknowhow.com/edible/fruits/apricots/apricot-tree-not-fruiting.htm

I would also have the soil in that area tested. For the trees to die like that or not be healthy, there could be something in the soil, or missing from it, that is affecting the overall health and growth of your trees.

It could start producing this season or at within the next one. Should your tree fail to put out any fruit, this article will help: https://www.gardeningknowhow.com/edible/fruits/apricots/apricot-tree-not-fruiting.htm

The brown spots may just be a bit of fungus. The fungus will not hurt you, but you may want to start a regimen of fungicide spray for next year to prevent these blemishes.

This could have happened for many reason. Stress to the tree is the most common, but a fungus may have also attacked the leaf buds s or it may have been thrips that attacked the leaf buds. Since the tree was obviously under stress of some kind, it would have aborted its fruit in order to try to save itself.

If you can, have a tree professional look at it. These problems need a visual consultation to determine the root cause. If this is not possible, the best you can do is to make sure the tree is getting enough water and nutrients and to treat it with a pesticide and a fungicide. This would take care of the most likely issues causing this.

If the leaves are turning black, it is likely a fungus.

If the leaves are a powdery black, this is a fungus called sooty mold. It is typically accompanied by a pest infestation by either aphids or scale. If you suspect sooty mold, treat the tree with both a fungicide and a pesticide. Neem oil is a good choice for this as it is organic, both a fungicide and a pesticide and is safe for people and pets (and therefore consumption).

If the black is not powdery, then it is likely another kind of fungus, such as black spot, but there are several that cause black leaves. They can all be treated with just a regular fungicide.

If it was still bearing fruit up into last year, you can consider yourself very lucky. Most apricots only live for 20 years, let alone be productive. That being said, this does not mean that your apricot is done producing. Have your soil tested to see if there are any nutrient deficiencies. Even if you fertilize regularly, trace nutrients or a pH imbalance can hurt have an effect on its health. Those dead limbs should be taken out.