Robert Pattinson and Kristen Stewart 'worked hard at romance'

Robert Pattinson and Kristen Stewart apparently "couldn't have tried harder" to make their romance work.

The pair are believed to have split earlier this month, with Robert moving his things out of their shared home. According to reports, the Twilight stars struggled to move on after Kristen was unfaithful last year with married director Rupert Sanders.

"The truth is they couldn't have tried harder to make it work. There is genuine sadness - a really deep disappointment - that it didn't work out. But in the end I think they just ran out of steam. You can only keep banging your head against a brick wall for so long before the pain just isn't worth it," a source told British magazine Grazia. "They've never been able to get back to where they were before Kristen did what she did with Rupert. No matter what steps they took, that was always in the background. And every time they argued it was like falling on a bruise. Robert's had enough. He's that little bit older and wiser than Kristen, so in the end he was the one who had to take responsibility and do the right thing."

It has been reported that Robert lost his cool when he spotted new text messages from Rupert on Kristen's cell phone. According to celebrity blogger Perez Hilton, the 27-year-old British hunk saw a message from Rupert flash up on Kristen's phone on his birthday, so he "got straight up and left".

There is also speculation that Kristen became frustrated with Robert's friendship with singer Katy Perry. They have been spending more time together in recent months, and even reportedly crashed a wedding rehearsal together in California over the weekend.

Katy is said to be helping Robert through the recent break-up.

"Kristen has always been jealous of their friendship and the couple have had rows over it in the past - most recently just last month at Coachella when Rob joined Katy for drinks and Kristen was left with their pals at the hotel," a source added. "Rob and Katy have known each other for a while and have an incredible chemistry."

While Robert has seemingly turned to Katy as he battles his heartache, Taylor Swift has proved a shoulder for Kristen to cry on. The country pop star has been offering support to Kristen in recent weeks, as the split takes its toll on the 23-year-old brunette.

"She's in a very hard spot right now; she's absolutely devastated over Rob. She's broken, but she's also really angry with him. Kristen is hopelessly in love with him." (Source)