A source tells Us that the pair have decided to take a break because of their busy schedules. (Earlier this month, Waterhouse actually received a flower delivery from Cooper during Us' Mar. 6 phone interview with her, which hits stands this week.) See pics of Suki and Bradley pre-split.
Cooper, 40, has kept busy since first being linked to Waterhouse, 23, in March 2013. The Oscar-nominated star often brought the British model as his plus one to red carpet events, such as the 2014 Met Gala and the 2015 Oscars in February, where he was nominated for Best Actor in a Leading Role. In June 2014, Waterhouse packed on the PDA with Cooper when she visited him on set of his drama American Sniper in L.A.
More recently, Cooper has been on the East Coast starring in Broadway's The Elephant Man in NYC. He's also set to appear in Netflix's Wet Hot American Summer reboot later this year.
The couple have kept tight-lipped about their relationship, but Waterhouse did admit that she would love to have kids during an interview with Elle UK in December 2013. As of late, an insider told Us, she even was warming Cooper up to the idea of marriage.
"It's up to Bradley to pop the question, of course, but she hopes it happens soon," the source previously told Us, noting that Waterhouse spends time with Cooper's mother Gloria when he's busy working. "She wants Gloria to know she's in the relationship for the right reasons."
E! was first to report the split news.