Q.Azalea plant in a pot
This was a beautiful established plant with masses of lilac flowers. I left it in the front of the house in full sun but later moved the pot to partial shade. Now in mid May all the flowers have died off. Have I killed my beautiful plant or would the flowers go at this time of year?

Blooms on an Azalea appear all at once and last about 2 weeks.
Your plant is likely just finished blooming.
Here is an article to refresh you on the care requirements.
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azalea-plants-in-pots.htm