dissipating

ˈdɪsɪpeɪt

verb

(with reference to a feeling or emotion) disappear or cause to disappear.

the concern she’d felt for him had wholly dissipated

disappear,vanish,evaporate,dissolve,melt away,melt into thin air,be dispelled,dematerialize,disperse,scatter,drive away,dispel,banish,quell,allay,check,evanesce