We live in Massachusetts. Spring 2010 was a bit wet and warm. Our weeping cherry bloomed as usual. However, there were a few hard freezes while the tree was flowering before the leaves came. We had very few leaves on the tree after that and also the summer was horribly dry. The tree was watered but nonetheless it didn't seem to do well. This spring there is nothing on the tree but there don't seem to be any bugs or that type of damage. However, we can easily break off the branches and it appears to be dead due to shock. The tree is probably close to 15 years old and we've never had this problem. Is the tree dead? How do we know? Help!