It is most likely dying, sorry :-( Azaleas do not make good long term houseplants. They are meant to be outdoor plants. But like a number of other colorful, flowering outdoor plants, they are often grown under greenhouse conditions and forced into bloom out of season and sold as temporary - disposable - houseplants. It is simply too warm indoors, too dry and without sufficient light to keep them alive for very long. If this had been sold as an Easter gift - they often are - your chances would have been better as you might have been able to transition this plant to the outdoors, although that is not aways an easy prospect either.

FWIW, tree form azaleas are even harder to transition and grow outdoors than the more typical shrub form.

Oh that is sad news :( We were so excited about this cute little tree... even if it didn't have blooms for most of the year... :( Well thank you for your reply..

I would keep treating it like it were alive and see what it does. My azalea lost quite a few leaves and then re-bloomed. It was known as a patio azalea that my son brought home from work I just made a post about it. I have it in a south facing window with direct winter light.

Oh and what kind of water are you using? I only use rainwater for my houseplants. If you can avoid tapwater do so.

Oh and you need to let it dry out between waterings.