So at dinner tonight, my FI asked me if I have one of his friends (let's call her Tammy, since I don't want to use her actual name) added on Facebook. I said "no" and asked why. Then he said something about a Tammy telling only a select few of her friends some big secret, and he said this secret was eating at the back of his brain (as in it was bothering him). I asked what it was and he said he couldn't tell me because he felt like he would be breaking his trust with her. Tammy is "supposedly" his best friend, yet we almost never see her unless it is for some sort of party she is throwing. My issue is this... What sort of adults play games like this and keep secrets? She's either 23 or 24 and she acts like she's about 14. I never really liked her since the first time I met her. She acts very immature, and I don't comprehend why my FI would want to be friends with someone like her. He's been kind enough to pick her up from the bar several times because she was to drunk to drive, and many of these times, she's had to crash at our place. Anyway sorry to go off on a tangent. I'm just really frustrated and I do not like that another female is causing my FI to keep secrets from me. Is it wrong of me to feel this way?