The "Just In Love" hitmaker is gutted that Hadid has started dating the former One Direction star so quickly, reported E! online.
"He was a bit upset how fast Gigi went out in public with Zayn, but it is what it is at this point. He still has feelings for Gigi that won't just disappear overnight. They did love each other and he still has a love for Gigi," a source said.
Since his split from the 20-year-old model, the 26-year-old singer doesn't want to rush into a new relationship and is planning on focusing on his work, family and friends.