Hayden Panettiere is looking for someone "driven." The 'Heroes' actress tells Seventeen magazine in a new interview that she needs a man to have ambition.

"I have to be with someone who is very driven," the 18-year-old actress says. "When they're not, it becomes difficult."

Panettiere, who is currently dating her co-star Milo Ventimiglia, explains why her relationship with reality TV star Stephen Colletti didn't work out.

"I knew I was at the point where I knew I needed to figure things out. I needed to learn more about myself because I'm a little confused at the moment. And I don't think I could every fully give myself to somebody until I do."

The animal rights activist also shares the lesson she had learned in splitting from someone, and that is to do it "the second [it] pops into your head. Because the longer you wait, the more difficult it becomes, for you and the other person. And in the end, it just turns into a mess."

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