The "Stranger Things" star was spotted attending a production of The Lehman Trilogy in London with the "Smile" star earlier this month. And while he was reportedly still with "Fantastic Beasts and Where to Find Them" star Alison at the time, a source has now told Us Weekly magazine that the pair broke up "around a month ago".
David and Alison first sparked speculation of a romance in January 2018, after they were seen cuddling up at the BAFTA Tea Party. Alison later confirmed her romance with the "Hellboy (2019)" star in a post on Instagram on Valentine's Day (14 February), writing: "I'm sitting here and I'm thinking to myself, wow, this human being that I am on this crazy journey with is pretty unbelievable," Sudol gushed on Valentine's Day. "What a generous, large-hearted, roaring wonder of a person I get to walk around and do stuff with. Like eat food and read books out loud and watch our dog sleep. And isn't that great. What an ignited soul, what a fire-spirit. What a brilliant artist. What a caring, deep, intuitive individual, who has changed my life completely and utterly. What a lucky woman I am."
"Love is a really great thing, and rare, and makes me think that a day to celebrate it maybe isn't the worst thing after all. Thanks for making my life infinitely more all of it, @dkharbour."
David and Alison were last seen together in April at a screening of "Hellboy".
Meanwhile, mother-of-two Lily has been single since splitting from boyfriend Meridian Dan earlier this year.