Entertainment Tonight.

Bristol Palin -- the daughter of former VP candidate Sarah Palin -- won't be wedding the father of her child because he's not "mature enough."

Levi Johnston gave an exclusive interview at his Alaska home with Neal Karlinsky of "Good Morning America", where he gave his reasons for their recent split.

"We were just, we were in a fight. And trying to see if we can make things work. But this is what it kind of ended up turning into," the 19-year-old said.

"It's just us not, me not being mature enough, or something, and having a kid and thinking ... it could be better -- better for us to separate for a while," he added. "We'll see how it is ... We'll just remain friends for now. We're both cool with that decision, and we'll see."