The director-actor duo fell out over the 2000 movie and although they are on good terms now and working on a new "Trainspotting" movie together, Boyle said he had treated his friend badly, reported Female First.
"We weren't particularly respectful towards him, way back in the day. But he's always been very, very generous. So we met and talked and I said how sorry I was, the way we had treated him. And it rebuilt from there," Boyle said.
McGregor said their friendship and working relationship has come full circle.
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