Since people on twitter have annoyed me
Let me just analyse the character
Ruhaan is genuinely friendly person who helps people remember first scene with Pari( other thing that pari mistook that too ) khair
He is close to Pari too ,his love for mishti doesnt mean he stops caring for Pari
he does care and he was normal with her
Coming to wiping her face with kerchief what is big deal in that