Someone help me understand this.

Hi everyone. So I noticed a close friend of mine gf changed the way she greets me. It used to be “Good morning” now it’s just “My name and What’s up” … I’ve been trying to rap my head around why this change. I don’t want to worry about it too much but at the same time I need to do something about it. I’ve never been close to her. We don’t talk for 5 mins for any reason. Just greetings. She has showed behaviors that has made me even take decision of not eating her food whenever I go visit them for sleepovers and all. Note this is my closest friend. I need you guys to help me understand. My own girlfriend is heated about it and calling the act disrespectful cos she greets my close friend very well and also even the girl I’m talking about. My gf greets them both with “good morning” and now “their name and What up like they are friends”.

 

I don’t wanna bring it up with my friend cos I’m sure he might talk to her about it and she will not take it the right way like normal people do. That’s why I can’t tell my close friend about her girls behaviors.