Beautiful Lavender

My Lavender plant is dying. Any suggestions?

I bought a beautiful lavender plant in full bloom from the supermarket; I repotted it because it was rootbound. Now it’s dying. Or at least all the leaves are drying up and falling off. Any suggestions? or is it a hopeless case?
I have been watering it. I want to keep it as a houseplant. Do lavenders survive as houseplants?

You may have been sold the wrong cultivar…..Hidcote and Munstead are the tought ones that grow outside in full sun and warm weather…..easy to grow…..I don’t know where you live or if it’s too late to put in the garden, but i believe that is where it belongs……supermarkets sell everything nowadays….

Beautiful Lavender Farm