I think they gave the right advice...maybe they know that one of them might get eliminated this week hence telling Asim to be prepared and advising him about his game
Arhaan Is definitely with Asim coz he has seen that Asim can take a stand against Shukla and he did he get a lot of support outside as well so Arhaan is trying to stay in the good books I feel
I also loved what Himanshi told him that girls respect him coz of the way he behaves them and he should treat them the same way he's been treating them
So, yes Asim should be vary of Arhaan ..he should be friendly with him but not completely have blind trust on him