The day after the Boston Marathon bombings, a moribund Mark Wahlberg returned to LA. The actor had been in New York Monday, where he reluctantly attended the premiere of his new movie, “Pain and Gain,’’ just hours after the explosions that killed three and badly wounded dozens of others. “I really didn’t even want to come tonight. I hadn’t really heard much — I spoke to my mom, and most of my family seems to be OK,’’ the Dorchester native told reporters on the red carpet. “[The Marathon] is such a big event, there’s so many people there. It’s horrible man. It’s [expletive] disgusting, man. I just — I’m very upset.’’ Wahlberg, who has four children with wife Rhea Durham, said he relies on his faith to get him through. “You try to put everything in God’s hands and whatever happens here is out of our control and there’s a bigger picture,’’ he said. “But it’s still obviously upsetting.’’ On Sept. 11, 2001, you’ll recall, the actor was booked on Flight 11 from Boston to Los Angeles, but changed his ticket at the last minute to attend the Toronto Film Festival. The flight was the first to hit the World Trade Center.