GIGI DUMPS DRUGGIE ZAYN

After more than three years together, Gigi Hadid and Zayn Malik are headed in One Direction: apart! “Gigi couldn’t stand by and watch her boyfriend kill himself,” dished a pal, hinting that the “anxiety” that caused Zayn, 26, to cancel shows and become a hermit was actually a drug problem. “For months she begged him to go to rehab or therapy, but he just ignored her.” So did his family, who turned a blind eye to Zayn’s issues — and stopped speaking to Gigi, 23, after she pleaded for their help! But Gigi’s clan, reality star mom Yolanda and fellow model Bella, had plenty to say. “Every time they saw Zayn they’d tell her, ‘Gigi, he looked like he was on something!’” noted the tipster, adding that the final straw was when the “Pillowtalk” singer sniped at his galpal for not being curvy enough — a result of her autoimmune disease: “Gigi cut him off in mid-December. She gave all she could and Zayn refused to change. She wasn’t going to be his enabler!”