I think we can agree she was used at some point, going by how she is acting and has done like this in the past. Alvin obviously broke ayus trust. I think that might be all we will learn about it. But go ayus. If she had a falling out before HK, she might just be keeping her appointments and plans before what ever happened, which shows good character on her part
Though it might of been a little of a avex crack down too on Alvin. I doubt they would like his posts about ayu, after they are trying to keep her personal stuff off twitter