Someone who display qualities of desperation during the initial dating phases. A descriptive word for the person who likes you more than you like them. Someone who lacks discretion and does not take verbal or non-verbal cues of rejection.
What the hell-why is the guy you met on the internet becoming your love monster! Your love monster has called you for the tenth time today-he's tact! I know you like him, but sister, do not become a love monster.