He's been one of her "biggest supports".

Selena Gomez's boyfriend The Weeknd made sure to do everything he could to be by her side during her medical emergency this summer. The pop star revealed in an emotional Instagram post on Thursday that she had undergone a kidney transplant over the last few months in her fight against Lupus. https://www.instagram.com/p/BZBHr4Pg5Wd/?taken-by=selenagomez The 25 year old, who was diagnosed with Lupus in 2015, explained that she would be opening up about her "journey" soon as she thanked her best friend Francia Raisa's "ultimate gift and sacrifice". And her boyfriend of nine months, The Weeknd, has reportedly been a rock for the singer and actress during the difficult time. According to People, the R&B star, named Abel Tesfaye, had rescheduled his summer gigs so he could be there by Selena's side. https://www.instagram.com/p/BYpoIf7AlIK/?taken-by=selenagomez And a source close to the singer told the publication that The Weeknd has been one of Selena's "biggest supports". The source added:

“Abel has been one of her biggest supports. She had been traveling with him on his tour and he was off during her surgery and right after during her recovery. “He’s been very caring and it’s meant a lot to her to have him by her side.”

https://www.instagram.com/p/BS7VkPTg0-s/?taken-by=selenagomez It comes after TMZ reported that Selena Gomez reportedly went into kidney failure while she was visiting The Weeknd on tour. The singer was said to already be on the transplant list when she  got into difficulties in May. She was reportedly rushed to a Chicago hospital with her boyfriend "right by her side".