Dumped Rohan Antao revealed that Pinto not only compelled him to stay mum about their engagement, for the benefit of the movie, but also snubbed him to be with her onscreen lover.
The 24-year-old further said that his former love gave him the thumbs down in a phone call while she was promoting the film with her 6-year-junior co-star.
"She ended it with me after getting close to Dev Patel. Now everywhere I go I see them on billboards. I am devastated," News of the World quoted Rohan as saying.
"I hate the film. It wrecked my relationship. As soon as it became a success and she started spending all her time with Dev, she ended it," he added.
Rohan continued: "She decided she didn't want to be with me any more. She said she wanted us to be friends. But how can I be when she has destroyed my faith in love?
"She is infatuated with Dev. I don't know if they were having a sexual relationship but if I came face to face with him I would have things to say.
"This is a very hard time for me, because as much as I don't want to let go, I have to.
"I wish her success in her career, but I can't watch the Oscars, and I don't want to watch the film-it wrecked our love."