There is a girl at work who has shown interest in me and has asked me out several times. I've tried to explain to this girl that i am in a committed relationship and have no interest in her. Despite this she continues to ask me out, she is a nice girl and i don't want to have to be cruel to get rid of her but i am running out of options. What to doAlso i haven't told my girlfriend about her as she can get jealous and possesive, should i tell her? and how should i do it?