Chris Pratt "ripped open some wounds" whilst filming 'Guardians of the Galaxy'.
The 37-year-old actor admits it was tough having to confront the loss of his father whilst working on the second instalment of the fantasy film series.
He said: "The truth is I ripped open some wounds that had been healing for some time. And I didn't want to. But I knew it was right for the moment ...
"There are wounds that are never going to be totally healed. It would probably make for a better story if it was some emotional thing that I hadn't dealt with ... When we face the death of a parent, you sometimes feel regret that you didn't fully embrace what you had."
And Chris has been busy working alongside Jennifer Lawrence in 'Passengers' and has dubbed her "one of the greatest actresses he has ever had the pleasure to work with".
He added to GQ magazine: "She is truly one of the greatest actresses I've ever had the pleasure to work with. She acts like Adele sings. You just sit back and you think, damn, some people ... She's a terrible singer!
"But she's a wonderful actress. She could just do it. She could just turn it on and it strikes emotion in you, like some people can just open their mouths and sing."
Meanwhile, Chris previously revealed he is taking a six month break from acting so he can spend time with his wife Anna Faris and their four-year-old son Jack.
He shared: "I've been on the road for 14 months - I did three movies back to back to back - so I'm taking six months off.
"I'm taking Jack to Jack's Beach - which is what we named the little stretch of beach on an island up on the San Juan Islands where we got a place. We're going to go back to the fort we built about a month and a half ago when we went for a short visit and see if that's still there. If not, we're going to build it again."