Put it outside. Shelter it against strong wind & sun. Check the foliage carefully for spider mites.
Cherries are a temperate plant group from the rosacea, and will always die inside. They need the seasons, and -as all plants- prefer the moist air outside.
Repotting has probably done the deed in this case. Repotting in mid-summer is certainly possible, but you need to know what you are doing, provide the right aftercare, and do it at the right time for the tree, bot on your calender.