Kate Winslet is a heartbreaker!

The gorgeous Oscar winner has been playing the field since splitting with her husband Sam Mendes, and she’s apparently breaking hearts along the way.

According to her recent ex, model Louis Dowler, he was stunned when she dumped him, and still can’t get over the loss.

“I don’t think Kate behaved well and it is still very raw for me,” Dowler told the Daily Mail about his breakup with the 35-year-old actress.

“I was in love with her and you can’t switch that off over night,” he said.

Dowler shared that the two went on what should have been a romantic trip to Sir Richard Branson’s luxurious Necker Island, but after leaving the vacation Kate promptly ended the relationship.

“I’m not sure Kate treated me well,” Dowler said.

He rehashed the relationship, detailing the intimate events they shared.  “Kate came home with me to Cornwall and we just hung out together.  She met my parents and family.”

Going on to claim: “I don’t want to go into details but it wasn’t a straightforward break-up. I’m a laid-back guy, so I am not walking around with a long face — but I do still hold a torch for her.”

Meanwhile, Kate has rebounded with Branson’s nephew, Abel Smith, who split with his wife Eliza Pearson, after just 20 months of marriage.

Smith, who changed his name to Ned RocknRoll several years ago, works for the space-travel branch of the Virgin empire.

Winslet divorced Mendes in March 2010, she was previously married to Jim Threapleton from 1998 – 2001.