Me and my boyfriend have been best friends for more than 10 years and started dating about 8 months ago. I introduced him to my sister not long after we started dating and now they hang out ALL the time nearly every night and always on the phone too each other it makes me feel so inadequate. I love this man more than anything and I don't understand why my sister would take it further, (she has told him how much she likes him) I just don't know whether or not to trust them or if I'm over reacting by not trusting them. I would be completely heartbroken if he left me for her but I cant help feeling like it will happen, I just don't know when. Do any of you think its inappropriate or am I overreacting? x