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The singer also told People that she has changed all her contact details so that ex-lovers cannot ruin her new relationship.
"I just told him today, 'You're the love of my life'," said Simpson. "I don't really ever say that to anybody."
She continued: "I don't want anybody that's been in my life [before] in my life anymore. I don't even want them to have any way of contacting me."
When asked about rumours that Romo still speaks to his former girlfriend Carrie Underwood, she commented: "I'm not a jealous girlfriend."
Simpson was previously married to Nick Lachey. She has also been linked to John Mayer, Dane Cook and Maroon 5's Adam Levine.
