More than jealous, you sound insecure (though I suppose the two go hand-in-hand). I was surpised that your list of why you were jealous had no mention of her behavior towards him-- I was expecting at least some mention that she was flirting with him or you overheard him flirting with her etc. All she did was be herself-- a well-groomed pharmacy intern who probably has 0 interest in your boyfriend, SO CHILL OUT!
And work on improving your self-esteem so you don't feel so threatened by those you feel are somehow "better" than you. I know because I've been there and it can be overcome.