The Born This Way hitmaker insisted at the time that the passion between her and Bradley was just an act, but following the actor's reported split from his model partner, the questions have once again been raised. "They tried to save the relationship but it had changed".
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The source asserted that since the two always kept their relationship out of the spotlight, not a lot of people knew that they were having troubles.
Before performing Shallow, the hit song from A Star is Born, Gaga said: "One more thing, be kind or f**k off".
During Cooper's speech at London's Royal Albert Hall back in February, the actor and director - who picked up a BAFTA for Best Film Music - thanked Shayk for being by his side throughout filming.
'I have to thank Irina, ' he said, 'for putting up with me for all the music I was trying to make in our basement for a year'. "Thank you very much".More news: Transfer: Ex-Manchester United coach warns Solskjaer not to sign Bale
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News of the couple's split emerged last week after a four years together.
Rumours of a romance between the two came shortly after their emotional performance of Shallow from A Star Is Born at the Oscars.
"Ever since then, Irina has not been able to trust Bradley at all", a source admitted, adding that while Shayk was well aware that "things were bad" she still "wanted him to commit and get married and show her more affection in public". The source asserted that it felt like they weren't truly making a life together outside of the child. "If he was in L.A., she's out of town, and if she was in town, he was out of town".