One can have a lot of admirers, colleagues, peers w/o labeling them as friends. Since we now know that Mayank's standard of friendship is pretty high (trust is the basis of his relationship), no wonder he creates an aura around himself which he doesn't allow many people to penetrate.
So superficially he can be talking to many people, but deep down he cares only for a selected few. Which is why he took the extra effort to cheer up Nupur ( by taking her to the beach) when she had a tiff with Gunjan. So, no he is not arrogant, just reserved and selective.