Justin Bieber's commitment and marriage to Hailey Baldwin was a surprise to the world, but the developments have had a more profound impact on his long-time ex-girlfriend, Selena Gomez, a source told PEOPLE.
"Selena can be a delicate flower, especially because she has had constant medical problems, but Justin's commitment and quick marriage surprised her and hit her hard," says a PEOPLE music source.
Gomez, 26, is seeking treatment after recently suffering an emotional crisis while in the hospital, a source told PEOPLE on Wednesday.
"She and Justin have been in and out for years, although they were so young when it all started," the insider adds. "Justin was her first great love, and she is not on him."
The singer of "Wolves" experienced a "panic attack" during her second stay in the hospital in just a few weeks: she suffers from a low white blood cell count, a common side effect for patients with kidney transplants, she said. a source to PEOPLE.
Now, the music expert says that Gómez is recovering while seeking treatment and is anxious to return to normal.
"Selena feels better," says the source. "She is getting the help she needs."
RELATED: Justin Bieber "has not finished" Selena Gomez despite the marriage with Hailey Baldwin, says the source
RELATED: Selena Gomez seeks treatment after an emotional crisis in the hospital after a few "difficult" weeks
As for how Bieber, 24, has reacted to Gomez's struggles, "It's hard for him to hear that he's not doing well," a source close to Bieber told PEOPLE after the Canadian pop star was seen crying in a vehicle with Baldwin. 21, the Thursday following the news of Gómez's recent hospitalization. The pop star was also photographed that day hugging friends after driving to church in Los Angeles.
"This was her first big love, and while she was young and traveling around the world like a superstar, she learned a lot from her," a Miami music source told PEOPLE.
RELATED: Justin Bieber seen crying after the hospitalization of Selena Gomez: "Always take care," says the source
"I was extremely upset about what happened to Selena," the Miami music source added. "She feels that she is part of her life and wants her to be happy and healthy."
When talking about the impact of Gomez's struggles on Bieber's marriage to Baldwin, the musical source said: "It could be a problem in the future."
Still, Bieber's source maintains that his recent "gloomy mood" was not a direct result of Gomez's challenges.
"Justin had a difficult week, but it was better over the weekend," said Bieber's source. "He spent time with Hailey, close friends and mostly got cold. Like most people, he has his ups and downs. Last week he felt a lot of pressure for things, like creating music, why he does not feel like he's ready for that at this moment. Over the past few days, he tried to concentrate on the things that make him happy. "
The source adds: "Hailey makes him super happy, he feels bad because Selena is not doing well, but that has nothing to do with his dark mood a few days ago."
RELATED VIDEO: Selena Gomez seeks treatment after an emotional crisis in the hospital after a few "difficult" weeks
A source close to the "Back to You" singer told PEOPLE that Bieber's recent marriage to Baldwin was one of the many factors, both emotional and physical, that contributed to his recent challenges.
"It's been a combination of things that affect their emotional health," the source told PEOPLE, referring to Gomez's announcement that he would take a break from social networks last month. "She has certain triggers and she is also a very sensitive person and that is why she isolates herself from social networks." The negativity and hate that she receives affects her more deeply than most celebrities because she takes everything in serious".
RELATED: Justin Bieber is "feeling a lot of pressure" for the new music: "He wants to stay alone", source
RELATED: The most revealing quotes from Selena Gomez – From Surviving Anxiety to Fighting Anxiety
While the source added that "having Justin's relationship everywhere is not easy", Gomez has continued to deal with health problems stemming from his battle with lupus and the resulting kidney transplant in the spring of 2017.
"She has also been dealing with other stressful situations and returning to the hospital was really difficult and brought back difficult memories," said Gómez's source. "It's not fair to say that this caused it or what caused it because depression and anxiety are very stratified, she knows it's something she will face for the rest of her life, but she's committed to addressing her problems head-on."