How to protect oneself from allegation of having Illicit Relationship

I had a friend on facebook who often chat with me about her married life problems and about her mentally retarded girl. She wanted to get divorce due to her own reasons. I suggest her to settle her matter in presence of the parents but some day she left her house and began to live with her parents. Now her husband has filed a case of 156(3) and had mentioned my name as accused of having illicit relationship. He's made a fake witness saying that I'd stayed his house with her wife for 3 days while I've never gone his house bcoz I'm 80% physically disabled person. His fake witness has given his fake statement to investigation officer. His wife has filed 3 cases of DV, custody and maintenance against his husband. The cases are in court going on. Please suggest me how to protect myself from this matter. Thanks!