<human>: I have two very close friends. We all hang around the same social group and they are friends with each other too. Last night my female friend who, for the sake of the story, I'll call Kate, and I were sitting out smoking cigarettes and drinking and she admitted that she was developing feelings for our male friend who I'll call Jack. The male friend is one of the best guys I know and has been almost a brother  to Kate they are so close. They are close and share some level emotional intimacy which I think has led to these feelings. 

We used to joke with Kate about that she should get with Jack but she was never attracted to him. Frankly I wonder if she is now, because though I would never say it, she would be settling for him in a significant way strictly based on attractiveness. Beyond that they are very different and although they are great friends I just don't know if I can imagine them together in a romantic way. What do I do? I don't want to encourage this with out Kate considering the consequences. He means a lot to her just as a friend and I don't want to see that implode and make things weird in our group forcing people to take sides. Kate came to me to see what I think and I want to tread lightly. 

Has anyone been in a similar situation with friends like this. I'm unsure of how to balance my friendship with both people and preserving the dynamic of our friend group while still letting them explore something that could end up being really great.

Provide a brief overview of the text.
<bot>: Two friend want to get together. This could ruin friendships if they break up. What advice do I give, should I encourage or discourage?