05/29/2009 AT 06:35 PM EDT
In a new interview, Levi Johnston gets a few things off his chest – starting with his shirt.
The teen father of Bristol Palin's baby is bare from the top up as he changes son Tripp's diaper in the July issue of GQ.
In the article he says he believes Sarah and Todd Palin pressured their daughter to break up with him after Tripp's birth.
"Just going over there makes me pretty damn uncomfortable," Johnston, 19, tells the magazine. "Just going over there, and Todd and Sarah sitting there staring at me, doesn't do it for me. Todd never says anything, really. Sarah's ... a politician: She knows how to throw in a fake smile and look happy."
Johnston, an avid hunter who also poses for the magazine in fatigues and a rifle, says he felt the Palins were sending mixed messages as to whether they wanted him to be part of their family.
"I know that her parents didn't want us together ... so they probably put a little pressure on her," he said. "But at the same time, they told us they wanted us to get married when they found out Bristol was pregnant. ... I don't know what the deal was."
Johnston says he had been in love with Bristol and that their three-year relationship started to fall apart almost immediately after the Republican National Convention. As for a potential reconciliation, "Nah, I don't think that's gonna happen," he said.