Answer: Based on your description it is possible it is planted in a location that is too wet, or you have been overwatering it. This tree needs a well drained location meaning a spot where water does not collect or puddle. If it is raining you would not need to water it. Your goal in watering is to keep the soil slightly moist like a wrung out sponge, not saturated or sopping wet. To know if you need to water, dig into the soil with your finger and feel it. If it is still damp, do not water yet.
On the other hand, underwatering can also cause wilting. When you do need to water, water slowly and thoroughly so it soaks down deep into the soil. After watering, wait a few hours and then dig down and see how far it went. Sometimes it is surprising.
Since this is a new tree, I would strongly suggest you consult with your local nursery as well. They will be more familiar with your local soil and how much rain has fallen since you planted the tree. I hope it will be okay.
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