Yeah, just how fast this guy changed his personality and dropped his old life just screams drug abuse.Also, leos love acting for an audience. They might act like different people for different audiences. Could be all that leo energy was feeding off of eachother into a haze of partying, drama and performing.
Aqua moon seems like the type of person that would detatch really easily once they are sure of their decision. In general all the fixed signs hang on for a while but if they are 100% sure they dont want to be with the person, thy will drop them and never look back. But not all people will act like some people really can just be totally in love and move on fast just like that...
Also maybe air moons just detach easily and in general just dont get too tangled up in lingering feelings.. I dont know. They might rationalize that they dont need this person anymore and just move on.