November 19, 2018 08:05 AM

Sean “Diddy” Combs is working through his grief after the death of his ex-girlfriend Kim Porter.

Porter, who raised four children with Combs, was found dead on Thursday at age 47.

After breaking his silence with a video of the former couple dancing and canoodling for the camera while the model was pregnant, Combs shared a peek at a private memorial he held for Porter on Sunday afternoon. Held at his candle-filled Bel-Air home, about100 family and friends gather to honor Porter, a source tells PEOPLE. Mourners included Pharrell WilliamsMary J. Blige, French Montana and Kourtney Kardashian.

“It was a beautiful memorial for Kim,” a source tells PEOPLE. “Diddy is still beside himself. He was very emotional, but grateful how many of his friends showed up to honor Kim.”

In the Instagram story videos, Combs surveyed six glamorous photos of Porter set up on easels outside a home. On the ground, candles burned.

RELATED: Sean ‘Diddy’ Combs Reunites with Ex-Girlfriend Cassie Ventura One Day After Kim Porter’s Death

Sean Combs Instagram; John Shearer/Getty Images

He added three more Instagram posts, including a slideshow of pictures of time he spent with Porter and their brood. “I’ll raise our family just like you taught me to. Love you forever!!!!” he said. “I CANT BELIEVE THIS S—!!!!!! F—!!!!!! Smfh.”

“Words can’t explain,” he captioned a stylish photo of Porter in a beaded gold dress. “FOREVER AND EVER AND EVER!!! Infinity and BEYOND!!!!”

Kim Porter
Sean Combs Instagram

Alongside a breezy snapshot of Porter grinning behind the wheel of a boat, Combs dropped five hearts.

The Los Angeles County Sheriff’s Office confirmed Porter’s death in a statement. Officers were alerted after a woman was found unresponsive in Toluca Lake, California. She was declared dead at 11:40 a.m. local time on Thursday.

Her health status was described as a cardiac arrest in an emergency dispatch call obtained by TMZ. A source told TMZ that she had been battling pneumonia.

“Diddy is devastated and shocked,” a source previously told PEOPLE. “He and Kim were still very close friends and co-parents even though their romantic relationship didn’t work.”

“They were still a family,” the source continued.

Diddy, Kim Porter and family
Sean Combs Instagram

Combs and Porter, who dated on and off from the ’90s through 2007, share a 20-year-old son Christian and 11-year-old twins D’Lila Star and Jessie James. Combs, who has two kids from other relationships, considers Porter’s 27-year-old son Quincy his own.

RELATED: Kim Porter Dead: Drake, Rihanna, Nicki Minaj & More Celebs Mourn the Model and Mother of Four

Combs first commented on the death in an emotional Instagram post. “For the last three days I’ve been trying to wake up out of this nightmare. But I haven’t,” he said. “I don’t know what I’m going to do without you baby. I miss you so much. Today I’m going to pay tribute to you, I’m going to try and find the words to explain our unexplainable relationship.”

“We were more than best friends, we were more than soulmates,” he concluded. “WE WERE SOME OTHER S—!! And I miss you so much. Super Black Love.”

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