The aggrieved rocker claims he was "frozen out" by his bandmates until he had no choice but to leave - and he still doesn't understand why.
But Hawkins recently suggested Poullain's departure was a joint decision.
Poullain explains, "Against my wishes I have been forced out of the group. I have gradually been frozen out over a long period of time.
"The reason for this is not yet clear - certainly nothing to do with Justin's solo album which I think is a great idea. In any case it's inevitable the truth will come out in the end."07/06/2005 17:26
Spencer Morrill believed he was in a relationship with the singer and that she was hiding messages for him in her songs.
Was the singer unknowingly taking counterfeit pain medication?
Roberts had left the band in 2012, due to problems with blood circulation and other health issues.
The popstar turned actress is back in the studio.