The actor decided to bow out of the programme to pursue other projects.
His departure saddened his screen girlfriend Sian Reese-Williams (Gennie Walker), who wrote on Twitter that she'd been crying for three weeks over his exit.
After wrapping his last scenes, she tweeted: "So that's it then. He's done. Gutted. Wonderfully talented and a fabulous boy. We will miss him. Boo."
However, she promised that their final scene together would be "fun".
Alex's last Emmerdale episode will air towards the end of May.