expression, i-adjective
fickle; having many romantic interests
Describes a person whose affections or interests change easily, especially in romantic contexts. Often used critically.
See also: 気が多い
彼は気の多い人で、すぐに別の女性に目移りする。
He is fickle and quickly shifts his attention to another woman.
気の多い性格だと、長続きしないよ。
If you have a fickle nature, things won't last long.
From 気 (spirit, mind) + の (attributive particle) + 多い (many). The phrase literally means 'having many minds/spirits', implying a changeable nature.