ssgtssgt1, so did I... short story - lack of a pollinator. The "proper" pollinator is critical for Cherry Trees. For me, it was an example of "live & learn," but it took about 12 (wasted) years of watching two magnificent cherry specimens go fruitless to finally figure out the problem.
I trekked to our HOS Arboretum and procured the "proper" pollinator scions for my Nursery Miss-marked cherry trees; made the top-working grafts (a "hoby"), but it was too late - their limbs were too large in diameter and the 4-way cleft-grafts didn't take... Bummer " title="Crying or Very sad" /> This was all after I'd planted a "pollinator" and watched it slowly die of Bacterial canker... Double bummer " title="Crying or Very sad" />

My suggestion: find a very good pollination chart; decide if you want another cherry tree as a pollinator; or feel very lucky / talented as a grafter and chance grafting on a "limb." Or, go through some very labor intensive methods of finding & cutting the flowering branches of a known pollinator at the proper time to stick among your tree for the bees to work... A lot of work - every year.
This is tuff, it matches my own dilemma... and my answer was replacing all "three" trees with figs... I've done lots of grafting, and cherries aren't good candidates for dormant season "top working." But if you haven't got room for another tree - and remember, every commercial cherry orchard has several "rows" of pollinator varieties - you might chance cleft-grafting a 2 inch maximum diameter branch onto your tree. Plan to prune very heavy around the area, to allow the necessary sunlight for it to prosper.
Sorry if that sounds daunting, "I feel your pain!"

PS: "I never met a garden that didn't need work." Believe it or not - as a longtime member of the Home Orchard Society - I have! (but it wasn't mine!!)