Suki Waterhouse was frustrated Bradley Cooper never proposed to her.

The couple have recently ended their two-year romance and friends say the 23-year-old model had grown increasingly upset about the 'American Sniper' star's apparent reluctance to make a commitment to her.

A source said: ''Her friends have been convinced Bradley was close to proposing, but for some reason he just never came through.

''Suki was adamant that if he couldn't bring himself to commit to her, with or without a baby, then she's obviously not the right girl for him.''

And while Bradley, 40, has spoken about his desire to have a family, it seems Suki wants to focus on her career for the time being.

The source added: ''Suki loves Bradley but her career has just taken off and she wants to have a few more years of working and to get married before starting a family.''

The former couple's busy work schedules meant they were often apart, but Suki was hopeful things would change after Bradley signed up for a 12-week stint in London's West End production of 'The Elephant Man' - only for the handsome actor to warn her he would be too busy with the play to socialise.

The source told Grazia magazine: ''Suki was excited about Bradley performing in her hometown, but he made it clear they wouldn't be seeing much of each other.

''He's dedicated to the role and it takes up a huge amount of his time and energy - it overrides everything else. That was the final straw for Suki.''