The two were also reportedly engaged before they broke up on possibly bad terms (viaDaily Mail).
Here’s the real reason they broke up.
Understandably, Shayk revealed nothing of the breakup until she mentioned her perfect Valentine’s Day toE!

News: “A lot of food, expensive bottle of champagne, because I’m Russian.
I love an expensive bottle of champagne.
Chocolate and [a] cool movie.

Like yesterday I saw ‘Pretty Woman’ and that felt like Valentine’s for me.
It was really nice.”
The breakup also fueled rumors of infidelity after Shayk told E!
I think this is [the] most important thing in [a] man."
Magazinesource confirmed the rumors.