Is this a normal relationship that my boyfirend has with his sister?
I have been with my boyfriend (25 y.o) for two years. I noticed when we started dating, he seemed very proud of his older sister (29 y.o.). Being pretty, a dancer, homeboys jocking her etc. Understandable. He even had to mention to me that his HS friends were in love with her.
They live together in an apartment. It seems like where ever he moves, she moves out to that city. Anyways, when one comes home, they greet each other with a long 20 second hug. Every time. They buy each other gifts/clothing article/gadgets/items etc. One time, he even got her 2 pairs of laced bras. She wore it and he noticed the strap and asked "is that the one I got you?" She said "yeah!" and lifted her shirt to show him. When we're out in a group, he always calls out her name to show her something interesting and never acknowledges to show me. One time when he and I were going on a date, he hugged her a long good-bye and slapped her butt. They text each other like he's texting another girl, all excited when she texts; yes, I checked who he was texting because it was our alone time together. He trips so hard with guys she brings around and even tried to tell her not to sleep at a guys house. She's an adult mind you. Whenever she does a dance Split leg pose he'll stare at her like he's drooling. Then he sees me looking and plays it off and looks away but try to keep looking at the corner of his eyes or something like that.
Its really getting to me now. When we're together most of the time it's great, I feel special, he's all over me, hugging and kissing me. But when the sisters around he'll seem embarassed to give me PDA. Am I being stupid or is this even normal? I understand close siblings but I feel weird and uncomfortable about it all.