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Fruit trees only need to convert one in twenty blooms to carry a good crop of fruit, which means that when more are converted, they often naturally drop from the tree to allow for a more sustainable crop based on the size of the tree.

Cherry Romeo is self pollinating but does do better with another pollinator.
Once a Cherry gains good size it needs to be watered regularly, thoroughly and deeply during the fruiting period. Infrequent, shallow watering can deprive the fruit of much needed water, causing it to drop.
If your area is hit with a late frost, once the Cherries have started forming, this can cause them to drop as they are damaged by the harsh conditions.
Too much water is as bad as not enough water. Make sure your Cherry tree isn’t sitting in boggy, over wet soil.
Your Cherry tree, like most plants, will benefit from regular fertilization during the year.
https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-care.htm