Kristen Stewart put too much pressure on Robert Pattinson to settle down.

The 27-year-old actor was allegedly given an ultimatum by the 23-year-old actress and decided to break up with her after she ignored his pleas to take their relationship slowly upon his return from Australia, where he spent two months contemplating their future together while filming 'The Rover' earlier this year.

A source said told America' OK! magazine: ''Kristen wanted to go straight back to where they'd been before they first split up and pushed Rob really hard on it. She wanted the whole package: the house, the wedding and even the baby. It was all way too much for Rob to handle.

''If Rob had got his way they would still be dating but taking things slow.

''Rob asked for space and it sent her over the edge. She told him if he wanted a break, it would be permanent.''

The actress is reportedly furious with the British star ''because she feels like he took the easy way out.''

A friend insisted Robert is upset too, explaining: ''Rob has been a mess. He's the one that ultimately pulled the plug, but that doesn't mean it's any easier on him.

''Rob loves Kristen and he truly wanted to spend the rest of his life with her.''