July 30, 2015 08:15 PM

Nick Gordon has emerged publicly for the first time since longtime girlfriend Bobbi Kristina Brown died.

In a photo taken Monday, 25-year-old Gordon is seen walking with his mother, Michelle Gordon, while wearing Brown’s engagement ring on a chain around his neck. (While Gordon and Brown called each other husband and wife on social media, they never actually married.)

“Nick is very upset,” a source told PEOPLE earlier this week of Gordon. “You can say what you want about him and Bobbi Kristina, but he really did love her very much and is devastated that she is gone.”

Brown – the daughter of Bobby Brown and the late Whitney Houstondied Sunday at an Atlanta-area hospice facility, nearly six months after she was found unresponsive in her bathtub. She was 22.

Gordon is facing a $40 million civil lawsuit. In the papers filed by Brown’s conservators, he is accused of domestic abuse and stealing money.

RELATED VIDEO: Bobbi Kristina’s Cousin Defends Boyfriend Nick Gordon

Nick Gordon and Bobbi Kristina Brown
Christopher Polk/WireImage

“The passing of Bobbi Kristina is devastating to Nick and our family. Nick loved and cared for Krissi deeply, and he has suffered greatly each and every day they’ve been apart,” his mother told PEOPLE in a statement this week. “Nick and our family are in mourning, and we ask that you respect our privacy. Our thoughts and prayers are with both the Houstons and the Browns during this difficult time.”

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