Former Arsenal captain Pierre-Emerick Aubameyang has attributed the reason for him leaving the Premier League club in the January transfer window to his poor relationship with manager Mikel Arteta. Aubameyang, 32, completed the signing of his three-and-a-half-year contract with Barcelona on Wednesday after it was mutually agreed that he would leave Arsenal on Tuesday evening. The Gabonese had not played for Arsenal since being left out totally in the cold for a disciplinary breach in December after he returned late from a trip abroad to visit his ailing mother. Gunners manager Arteta subsequen…