Olivia Wilde insecure about future with Jason Sudeikis

Olivia Wilde has huge insecurities about the future of her relationship with fiance Jason Sudeikis, because Hollywood couples rarely stay together.

The Tron: Legacy beauty recently became engaged to the Horrible Bosses hunk after two years of dating and although she's confident their relationship is rock solid, she still worries that competition and jealousy will tear them apart later in life.

She tells InStyle magazine, "There are spikes and dips and plateaus in this business. I've seen couples fall apart through it, and it is heartbreaking. You wonder what will happen: 'Will he love me if I'm not as successful? Will jealousy kill us?'

"I know there will be times when Jason is working more than I am, but I'm actually excited by that. I'm excited by what he will become, what depth he has."

And Wilde hopes they will continue to be supportive of each other's careers after they wed: "I like having a real partner. It's the model I grew up with. It's part of why I was able to take so many chances in my life, because I felt like someone was watching my back. I could never imagine life without someone I respect, someone who offers me infinite possibilities."

Sudeikis previously dated Mad Men star January Jones, while Wilde was married to Italian royal Tao Ruspoli. They divorced in 2011.