I think Abhay went to Garv and asked him to fight Mahi's case. Then Mahi would have asked him why do u want to help me? Garv would have answered
"Mujhe Kumud se badla lena hain, aur mein uske maa ko dukh pahuchakar, kumud ko aur dukh pahucha sakta hoon." You know stuff like that. To make her believe that he is on her side for real.
There is another reason for me to believe that garv is not negative besides Garv being a nice guy is as follows:
How in the world did Mahi lose all the property when she won the case, especially when Garv was her lawyer who practically wins most of the cases. Garv called Kkusum, aurat in a mean way, why would he call her that all of a sudden, especially when he considered her as a mother.
Kumud was present in the court but not once did she go up to Garv and yell at him, as usual. May be Abhay told her about it. Otherwise Kumud would be the first one in line to criticize Garv.
What say guys? Future episodes will tell us.
Sam