Hilary Duff definitely appears comfortable in her own skin on the cover of 'Cosmopolitan,' and now she is opening up on why she is divorcing her estranged husband, Mike Comrie.

Hilary Duff Appears On Cosmopolitan's Cover In Short Shorts With Killer Cheekbones

On Tuesday, Cosmopolitan shared part of their interview with the singer and actress who's officially ending her marriage.

She wasn't afraid to speak her mind on the questions asked, and one of the most interesting was on her views of marriage, post-divorce.

Hilary Duff Shows Off Her Makeup-Free Face Just Days After Filing For Divorce From Mike Comrie

"I don't want to sound bitter because I'm definitely not, but I don't know if people are meant to be together forever. Things happen over a long relationship that you can't always fight," she said.

But fighting for happiness means sacrifices in a marriage, and Duff doesn't know if that's worth it to her. She gave the impression that it all just comes down to being there for herself and hoping for the best in her future.

"A marriage of 20 years, the accomplishment of that must feel really great, but there are also huge sacrifices. I just always want to fight for happiness," she said.

As she divorces Comrie, she is allegedly fighting for primary custody of her two-year-old son, Luca.

TMZ reported that the actress and singer wants Comrie to have visitation but is worried that his partying and drinking may interfere with his well-being and could adversely affect their son.

Tags: Hilary Duff Mike Comrie