Why does she act like it's nothing?

Anonymous
I was watching a movie and cuddling with my girlfriend, she was snapchatting with her friend in the meanwhile, so I could kinda see their conversation. They were talking about her friend's new nipple piercing, and my girlfriend had taken lots of selfies of us during that conversation, so her friend probably knew that I was seeing what they were chatting about, which made it a bit shocking for me to see my girlfriend's friend's boobs on my girlfriend's screen all of a sudden. This girl has made lots of obvious moves on me in the past, and my girlfriend hasn't cared at all. She didn't even care when her friend flashed us this time, either.
I guess I'm just confused. I'm unsure if my girlfriend doesn't really care so much that she can't even get jealous over stuff like that, or if she wants this to happen, or if it's something else entirely.
Why does she act like it's nothing?
1 Opinion