The news of their break-up came as a surprise as the brunette beauty never rejected the idea of marriage with her former beau.
Speaking previously about tying the knot with Wilmer, she said: "We've been together this long ... obviously I'm not going anywhere.
"I am very, very in love with him. I think - we will probably wait a little bit longer, but - if he asked tomorrow I would say yes."
And Demi has previously admitted her romance with Wilmer has been more "passionate" than any of her past romances.
The Confident singer shared: "When I dated white guys, it wasn't as passionate as my relationship with Wilmer. Maybe that's just Wilmer. But I do believe that Latin people are just more expressive, more passionate with their emotions."
"He's protective and he cares so much and loves so hard. I've been blessed enough to have him in my life, and not just as my man, but also my best friend.
"I've been my heaviest in my relationship with Wilmer and also been my thinnest.
"He's seen it all and loves me equally, and it gives me confidence to know that."
- Bang! Showbiz