My friend won't let me meet her boyfriend?

My best friend has been "dating" or kind of seeing this guy for at least a year now and I still haven't met him! She's my bestie and I really just want to meet the guy she keeps talking about I feel like I've known this guy my whole life. It just really makes me sad :[ She said I could meet him after they had sex and now they've don't that and It's a new excuse. I tried asking her about it and she says "I want to really know him before I let him meet you or people I know" I don't understand this... Why isn't she letting me meet him and how can I convince her to let me? And he lives about a half hour away and they see each other every once in a while if that helps any.
My friend won't let me meet her boyfriend?
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