<human>: I love my boyfriend and never has he given me a reason not to trust him.  He has values, very upfront and truthful and hates lies.  We've been together for over a year, and I feel as if we are growing together and on the right path.  
Anyway, he is reaching at the peak level of his career and has a great job.  The office got a new assistant 2 months ago.  I have met her, and she is very sweet, but I can immediately tell she has a huge crush on my BF.  The more and more I meet her, the more uncomfortable I feel.  It's weird.  I've been honest with him and how I feel, and he told me that there is nothing going on, she is very appropriate at work, that she looks up to him because she wishes to do what he does, and that to only look at it like an elementary school crush and nothing more.  He is right, and I can't keep flogging the dead horse, so I promised not to bring it up.  
How do I grow up from this and let it from occupying my mind? Is this just insecurity speaking? What is the best way of dealing with this as an adult?

Can you give me the gist of the text in a nutshell?
<bot>: BF has a coworker who really likes him, and is making me uncomfortable although BF gives me no reason to be.  Is it my insecurity? Or something going on? Advice