<human>: Can you summarize the given text in a few sentences?

My girlfriend and I have been together a little over a year.  The other day, she discovered that one of her friends has recently started seeing her ex.  Now this ex of hers, they weren't together long, but she seems incredibly jealous and upset that her friend is starting to see him.  This ex is someone she wants to have contact with, and the whole thing just makes me feel like she still has feelings for him.

Am I being irrational here?  in the early stages of our relationship we almost broke up because she was very confused if she still had feelings (after she thought about it said she didn't and was using it as an excuse to push me away).  I feel like if my ex started seeing someone else, I wouldn't care at all, friend or not.  
   

It's really bothering me, and makes me question if my girlfriend still has feelings for him or not.  I'm not sure what to do, I try to talk about it but she just brushes it off.  She says she feels betrayed by her friends, but why should it matter?
<bot>: Girlfriend upset her friend started seeing her ex, and it makes me feel she has feelings still.  What do I do?