The 23-year-old and Jonas, 22, have split after nearly two years of dating.
Culpo has been posting cryptic, melancholy messages on Instagram and Twitter and on Friday, she pretty much poured her heart out, reports eonline.com.
"Your heart just breaks, that's all," Culpo wrote, alongside a photo of a sunset and palm trees.
"Heartbreak is hard but you find more and more things to be grateful for every day. One of those things is all of you," she continued.
"Thank you all. Yes I'm going to be okay and I love u guys so so much. Every day is a blessing."
The two began dating in the summer of 2013 and over the past year, it looked like things were getting pretty serious.
Last September, Jonas confirmed that he had removed his purity ring, a piece of jewellery he and his brothers had famously worn when they were younger, as a promise "to ourselves and to god" to stay "pure till marriage".
Jonas penned his single "Jealous" about Culpo. The two attended many celebrity events together, as well as the 2014 Miss Universe pageant, where he performed and at one point, stepped off the stage into the audience and sang to the beauty queen on one knee.