<human>: Well my girlfriend pretty much admitted to me that she still has feelings for one of her ex's. The first time this came up we got into a big fight. This time It wasn't a big deal to me. I trust her, so I encouraged her to go talk to him in person, because there was a lot of unresolved issues between them.

Now I know that a lot of people see it as a red flag, but my GF reassured me that she is committed to our relationship and this won't threaten it. She said the thought of going back crossed her mind, but she never thought about it seriously. I understand how that feels though; I will admit I've thought about similar situations with my ex's and former interests.

Also, she was completely honest and up front about where she was. She was apologetic that she has put me in this situation and hates making me feel bad. This isn't the first time she's brought it up, but it's only been an issue twice since I started dating her, and gone away after a week or so.

Summarize the given text in a few sentences.
<bot>: Girlfriend still thinks she has feelings for ex, but says she is committed to me. I think I'm fine, but I want a second opinion. Do I have anything to worry about?