Is a friendship between an Ox/Leo 1985 with a Rat/Capricorn 1984 a good relationship?

My 'best friend' and I have been friends for a long time. I always introduce her to my friends as I feel she is a good friend. I see that she always tries to get in the middle of all my other friendships or in the middle of my inner circle friends and destroy the friendships. I first didn't think anything of it but now I'm starting to think whether she is a good friend to have around or if it's truly intentional. Any advice?