This is a relatively common issue and typically happens when some water is left in the spray head and freezes which will expand and crack the spray head. THIS is the unit that we use from Menards, but you can find nearly the same thing at Home Depot, Lowes or your local hardware store which should attach in the exact same fashion.

There is a video in the link that shows installation of the WHOLE system but if you watch from the 1-minute mark to the 1:20 mark, it will show you how to replace just the spray head. You can unscrew the top of the sprayer from the base where the hose goes in, then pop off the C shaped clip and pull the hose out and bring it with you to the hardware store, and they’ll get you set up.