the Dabbler

The dabbler approaches each new sport, career opportunity, or relationship with enormous enthusiasm. He or she loves the rituals involved in getting started, the spiffy equipment, the lingo, the shine of newness.
Dabbler specializes in honeymoons. He revels in seduction and surrender, the telling of life stories, the display of love's tricks and trappings: the ego on parade. When the initial ardor starts to cool, he starts looking around. To stay on the path of mastery would mean changing himself. How much easier is to jump into another bed and start the process all over again. The Dabbler might think of himself as an adventurer, a connoisseur of novelty, but he's probably closer to being what Carl Jung calls
puer aeternus, the eternal kind.

(George Leonard "Mastery. The keys to success and long-term fulfillment").