(First off sorry for formatting, mobile)

My girlfriend and I have rekindled our relationship recently after hitting a rough patch. She has her friends and I have mine and to get to the point, we are both in the band at the college (she's in the color guard) . And for those who don't know we band nerds change all the time together. The color guard changes separate and together as they are all made up of females. 

Yesterday after my classes I was in one the band room's practice rooms, catching up on some work. When a friend of mine ,(we'll call her J) who is also in the guard and knows my gf, walks in and asks to change in there, to which i say yes. As I'm gathering my things in my pack she starts taking her clothes off. I then just grab my phone and leave my stuff there. 

J then says "you didn't have to leave"

To which I respond "it's a matter of respect"

This small incident made me feel uncomfortable. So I did what I normally do. I talk to my girlfriend,(in this class text) I like to be transparent about everything with her.  She then takes this information and cold shoulders me, and just doesn't talk to me. I try to give her space, and she tells me how she feels after an evening with no communication.  I tell her I understand but I didn't like that she took her anger out on me. She tells me that I dont understand how she feels and that I'm being insensitive and I should just forget about it and it shouldn't be a big deal. And our conversation ends.

I saw her on campus today, frustrated, we talk some more about it and I tell her that it's not right  that shes talking her frustration out on me when I came for help. And I dont see this as something that put our relationship progress back. And she then said I clearly dont understand, it would be the last time she came to me about problems. I then said that's shes in the wrong, I can understand jealousy or J being disrespectful to us, but it's not right to take it out on me, and the strain of the relationship that is happening right now comes from her, and that she is being the problem instead of dropping it like she said to. I can be kind and understanding but this is ridiculous.

AITA?

