<human>: I met this girl about 6 months ago through my girlfriend (she had a class with her). We quickly connected and became friends, which is kind of unusual for me since I'm typically shy and don't make friends easily. I was really excited about our friendship since we had a ton in common. Things were going really well and we were hanging out a lot (usually me, her, my girlfriend, and her boyfriend).

However, about 2 months ago, my girlfriend's attitude started to change and she began to not like this girl. She suddenly did not like me talking to her and was suspicious that there was something between us. I assured her there wasn't, but it didn't change her thinking. I started talking to her less to try to help the situation, but my girlfriend is now wanting me to cut her out completely.

I don't think the relationship has been anything other than friendly, we don't even spend time alone together, but my girlfriend sees her as a threat and is sure she has feelings for me (I've never gotten that vibe). I feel like she doesn't trust me, but she always says that she's the one she doesn't trust (which I don't see what the problem is if she does trust me). It doesn't seem right to me to cut off a friend because my girlfriend now doesn't like her... I don't want to and I would feel really bad for doing it. I don't see anything wrong with us being friends even though we're the opposite sex. However, if she did have feelings for me, then I would agree that the relationship would have to end because I don't think it's right out of respect for your partner to stay friends with someone who is romantically interested in you.

I don't know what to do in this situation. I don't agree with my girlfriend's sudden resentment for this girl and her reasoning. And I don't agree with ending the friendship just because she "suspects" there's something between us when there's not. But, I guess she could be right about her having feelings for me, although I don't see it.

Provide a brief overview of the text.
<bot>: Girlfriend suddenly dislikes my female friend. Thinks she has feelings for me. Wants me to end the friendship. Unsure of what to do.