"Love does not just disappear, right along with the man who leaves you," Elena reportedly lamented.
"I really didn't want to give up. And I fought really hard for him, and I guess I didn't fight soon enough, or hard enough, and I didn't put in enough until it was too late. But I did fight for him until the very last moment."
Elena then dropped a bombshell that "the very last moment" of her relationship came when she "found out he had moved on with someone else from Tinder."
Mark, a 27-year-old fitness trainer, admitted he had moved on from his romance with Elena because he could no longer deal with her pessimistic attitude and the fact she spoke ill of him and their relationship on social media as well as in her own podcasts.
Elena acknowledged the year 2018 was a tough one for her emotionally, and she reportedly got choked up when sharing her side of the story.
"There was not one day that that man woke up and questioned the depth of my love for him. I didn't always show it the right way, but he knew I loved him," Elena said on her podcast, according to ET.
"I was not a perfect girlfriend. I took him for granted a lot of times. There are a million ways I wasn't the partner he deserves, and if I could go back and change so much I would. I'm sorry I saw him as a guarantee and I let him down, but I never did not love him."
Elena reportedly added she and Mark are "very different people," which didn't help things.
"I think that level of disconnect and some inability to effectively communicate and actively listen at times led us to where we are today," Elena shared.
The couple had been living together in Elena's hometown of Dallas, TX. Once Elena and Mark finished filming Big Brother in September 2017, he relocated from Buffalo, NY, to be with her.
Elena said it was difficult for her to just share the "good times" with her fans when life is not perfect.
She would often criticize Mark as being "far from Prince Charming," which he admitted was "a gut shot."
"I think that romantic culture has been ruined by fairy tales," Elena reportedly explained. "Not one single person in this world is dating Prince Charming."
Elena noted the pair had been fighting for a while and so neither of them wanted to renew the lease on their shared home when it was up, resulting in their decision to split and part ways.
"I think navigating any relationship is hard. Navigating one that started on reality TV with a person that is your polar opposite, and lacking the luxury of privacy was just something that, I guess, Mark and I couldn't handle," Elena noted.
"I loved Mark. I still love Mark, a f-cking lot -- oh, what a turn of events -- and my heart is absolutely shattered into a million pieces."
Elena admitted she feels it's "impossible at times" to survive this breakup.
"The only thing getting me through these hard days is knowing I can survive because I've survived before. Also, vodka. Also, Xanax. Also, my wonderful friends and family," Elena said, according to ET.
Elena, however, will hold on to the happy memories she shared with Mark going forward.
"Memories with him are some of my favorite memories. And I have never experienced a level of euphoria or bliss or happiness that I have when things were really amazing and good with Mark. I was obsessed with that man. I still am," Elena confessed.
"I wanted to be the girl of his dreams so bad. I hope to never have a podcast like this again."
During the former lovebirds' time in the game, Mark heavily pursued Elena while she pushed back in order to avoid being viewed as a power couple in the Big Brother house.