I’m not familiar with this cherry variety since it isn’t hardy here in zone 5…it is only hardy to zone 6. From what little info available on this, I assume you mail ordered it. It sounds like you either drowned it by over watering it or it contracted a fungal disease which cherries are prone to. You’ll need to find a place for it to spend the winter where temperatures are below 50° for the winter. When it shows signs of life in the spring (which it hopefully will do) you’ll need to start a regular spraying schedule with a good fruit tree spray following the directions on the label of course.