The enemy of my friend is not necessarily an enemy of mine. However how you handle that can influence your relationship with both people. I just had a friend of mine say to me that they could not be friends with me if I was friends with another person. Although I liked this friend a great deal and we had a lot of good times I could not allow someone to dictate who I can be friends with or not. Now if she was my partner in life ... that would be different. If my partner had an enemy I would have to view that person as an enemy too.