The former One Direction star told Edwards it was over by sending her a message two weeks ago and hasn't been in touch since, reported Contactmusic.
"It's unbelievable, he's an immature little boy with no thought for anyone else's feelings. Perrie is one of the sweetest girls in the world and she's stood by him through thick and thin.
"But he ended their engagement with one text message and in the two weeks since there's been complete radio silence between them. Who does that? She's devastated, which everyone understands, but is doing her best to focus on work and to put on a brave face in public," a source said.