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DearSugar Needs Your Help: Is the Writing on the Wall?

Dear Sugar and Left in the Dark Libby need your help. Libby is worried sick that her best friend is putting the moves on her boyfriend. How should she know if their friendship is crossing the line or if they are truly just friends? Do you have any advice to offer?

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My best friend has never had a boyfriend before. She has dated for a few weeks here and there, but has never been in a serous, committed relationship. She grew up with my boyfriend and has always spent a lot of time with us. We even call ourselves a little happy family! Recently, I have started to notice her staring at my boyfriend a little too seductively and overtly flirting with him right in front of my face!

Last week, she went out to a group dinner with him and some of our other friends in which she was the only girl. I didn't know she went until she reveled in the fact that I didn't know from my boyfriend first. I have since expressed my concern to him but he thinks I am being ridiculous to think that she has any interest in him. I don't want to jump to any conclusions or make false accusations if I am just being overly paranoid, so how can I tell if my best friend likes my boyfriend of 4 1/2 years?

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