My gossip might be more of a confession / secret.
At uni my then and current closest friend was totally in love with a guy on my course. They dated on and off for 2 years he was very good looking and highly intelligent but emotionally a disaster very avoident-dismissive and generally messed up. When they finally broke up my friend was heart broken about it because she did really love him. She did after a few months and the summer away start to get a little better and she began dating the guy who is now her husband, a kinder, stronger man, much better for her.
However what my friend doesn't know is that not long after her break up with the first guy, he changed his mind and desperately wanted her back and he used me as a go between. I totally manipulated the situation to keep them apart, I destroyed letters he wanted me to pass to her and relayed both of them false information about the other. When he did manage to see her himself I did all I could to run him down in her eyes including lying about seeing him with other girls. In the end when she wouldn't go back to him he had a kind of breakdown and dropped out of uni.
Looking back now I can see that my behaviour was manipulative and wrong and yet I find it very hard to regret. She could have wasted her life with that guy and probably would have if someone hadn't put a spanner in the works. I do still feel bad about it though, I know through another friend that he is only now getting his life back on track in his 40's and that he is still single and asks about her.
She on the other hand has a lovely husband and I belive a happy life, however if she knew what I had done I don't think she would forgive me.