The 'Bedroom Floor' hitmaker admits it was tough going out on stage some days as he felt like his smile was just a ''costume'' he had to wear.
He said: ''I shouldn't have been able to do as many shows as we did, if I'm honest about it, if I'm brutally honest about it. Going out and putting that happy smile on my face and singing the songs, honestly, sometimes it was like putting on one of those costumes, going out there and, underneath the costume, people don't really see what's going on.''
And the 24-year-old singer hit a real low when he split from his ex-girlfriend Sophia Smith and the band's concert had to be cancelled.
He added: ''I let it get to me that day. I wasn't in a good place. And unfortunately I was going through a rough time and I let it get to me a little bit too much. That was it. The more we did, I just don't think we stopped and celebrated enough how great things were and I think that's what got on top of us in the end. It was like, 'Oh, you've just won three EMAs, but get on the plane and go to the next place.'''
However, Liam - who has eight-month-old son Bear with his partner Cheryl Tweedy - knows fans weren't happy when One Direction split but he feels they all ''needed'' time apart from each other.
He told The Sun newspaper: ''Even though I know fans are not mad about it ... we needed it. We needed a little bit of time away from each other. We needed a realisation point to find the love for it again, rather than it just becoming a job. I'm a totally different person now to how I used to be about it.''
They'll hit the UK and Ireland this November.
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