Levi Johnston and Bristol Palin
03/16/2009 at 07:00 AM EDT
Nineteen-year-old Levi Johnston, the former fiancé of Bristol Palin and father to her child, has had to grow up fast, but says in a new interview that he needs to "mature" before considering marriage.
"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," Johnston said in an exclusive interview at his Alaska home with Neal Karlinsky of Good Morning America.
As for whether a reconciliation with Alaska Gov. Sarah Palin's eldest daughter is possible, he said, "We'll see how it is ... We'll just remain friends for now. We're both cool with that decision, and we'll see."
Of the breakup
that happened "a week, two weeks" ago, Johnston admitted, "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."
Bristol, 18, gave birth to a son
, Tripp Easton Mitchell Johnston, on Dec. 27, and Johnston says he sees his boy regularly – and it has changed his life.
"I'd give anything for [Tripp], to be with him," he said. "[There are] a lot of changes when you're a father, when you hold him for the first time, you know. I don't do a lot of things I used to anymore, I'll tell you that."
He added: "Yeah, [I'm] growing up a lot. So, it's fun. It's good times."
Asked if he felt any pressure from the Palin family, Johnston said, "No, not at all."