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Charlie Puthis rememberingMac Millerafter the rapper’s tragic death.

The “Done for Me” singer, 26,told E! Newsabout his friendship with Miller in an emotional interview.

“I had known him for about six months, but we became really close. We became really good friends,” Puth told the outlet. “I always thought I’d be the one to help him get clean and to lead him onto the path of a good, clean, sober life.”

He recalled learning that Miller had died. He said, “Every time someone close to me passes away I always text their phone and — I don’t know why I do this often — I just wrote, ‘I love you man,’ and I knew he wasn’t going to write back, but I just felt like I had to do it anyway.”

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Millerdied at his home on Friday. A source told PEOPLE that Miller went into cardiac arrest after an apparent drug overdose. The official cause of deathis yet to be determined.

Puth and Miller reportedly bonded because they both worked out with trainerHarley Pasternak. “We talked almost every day, and I don’t get a lot of friends who come into my life who I hit it off with so quickly,” Puth told E! News.

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The Meadows Music and Arts Festival, New York, USA - 02 Oct 2016

On Friday, Puth tweeted, “I can’t keep losing friends like this…I wish I spent more time with you these past weeks…I’m so sorry… rip MAC…you wrote the soundtrack to my college years and I’m so happy I got to know you…this sucks this really really sucks.”He added, “This is not real, I’m waiting for you to call me and say it was just a joke. I texted your phone before I know u got it….”

In February 2016, Millergot candid about his drug usein a documentary calledStopped Making Excuses. “I get f—ed up, let’s keep it real,” he said. “I get super f—ed up, still, all the time. That will never stop. But I’m in control of my life. I’m not f—ed up right now. I’m chillin.”

He continued, “I’d rather be the corny white rapper than the drugged-out mess that can’t even get out of his house. Overdosing is just not cool. There’s no legendary romance. You don’t go down in history because you overdosed. You just die.”

Puth shared more heartbreak onthe 17th anniversary of Sept. 11on Tuesday. Posting a picture of a handwritten note, he explained, “17 years ago today I wrote this in my diary when I was in 4th grade. #NeverForget.”

The diary entry started, “Dear diary, Today was a bad day.” He noted, “It’s sad but we must go on! We are a strong country.”

source: people.com