auto syncing macbook contact updates to iPhone
I have an iPhone 5c with iOS 8.3 and a Macbook Pro with OS 10.10.3. When I update a contact on my iPhone my Macbook gets automatically updated. But when I make an update to a contact on my Macbook, it doesn't get updated on my phone. It used to work great, but now it only works one way, not both ways. Why is that? How do I fix that?
MacBook Pro (13-inch Mid 2009), OS X Yosemite (10.10.3)