"Yanet and I are no longer in a relationship with each other anymore,' Martin began in the video, which has received more than 770,000 views.
"Yanet is an awesome girl, she deserves the best. She's beautiful, she's smart, she was an awesome girlfriend," he continued.
"I know it sounds weird I'm saying all this…it's just, I gotta do what feels right for me."
Martin revealed that he had flown "all the way out to Mexico" from New York three years ago to meet Yanet.
They began dating and eventually moved in together in New York for a year.
But Martin said everything changed when Yanet decided to go back to Mexico City to pursue acting and modelling and return to her job as a weather girl.
"I supported her decision," Martin said. "She wanted to be a supermodel actress - chase your dreams, life's too short."
"I'm playing Call of Duty full-time now and she wanted to take her job opportunity. I didn't think it was going to be that difficult."
But Martin found it harder to do a long-distance relationship the second time around because he was spending so much time playing the video game.
"Back then it was a lot easier for me to go out and see her," he said. "But now I have obligations."
"I'm on a contract. It's not like I don't want to do this, this is the career that I want."
"I want to win a ring, I want to win a world championship, what I want in my life at this very moment is to compete in Call of Duty because I love it so much."
"I'm going to do whatever it takes to be a champion."
Martin said he had to pick his "poison" of what he wanted to spend his "time and focus on", and the video game won.
"There's only 24 hours in a day and I just didn't have enough time to do what I needed to do," he said.
Garcia, who has 6.5million Instagram followers, has since thanked her fans for their support during the break-up and even shot a few subtweets at her former beau.
After writing that she was heartbroken, Garcia retweeted a tweet that read: "Respect yourself enough to say, 'I deserve better'".
She also tweeted: "Never listen to the advice of a person who has not done anything good with his life."
