besotted (by), crazy (about or over), dotty (over), enamored (of), enraptured (by), gone (on), infatuated (with), mad (about), nuts (about)

hung up (on), obsessedfoolish, silly, wildbewitched, captivated, charmed, enchanted, entranced, fascinated

stuck on, sweet on

cool, detached, unenchanted, unimpresseddisenchanted, disillusionedheart-free