Yaar he meant that he was with him so he saw her through his eyes.
Mostly he took game things only. He didn't say that he told personal things.
And we have seen Sid asking Vishal , Sana not to talk with Rashami in main episode itself.
It happens with most people if they stay with somebody older than them by a great margin. They automatically get that guardian feeling.
Now with Rashami afaik she is very mature person. She didn't even react Dogla tag by Mahira for which blood still boils as if it happened to me.
First of all she won't talk about it at all second she will understand that he was not her friend like she was telling Asim..
Actually Sid, Rash, Vish, Sana,Madhu, Bagga, Dey and Asim are genuinely nice people.
Devo, Arti are mildly nice.
Paras , Mahira coming across as evil.