Well if your friend is self centered and thinks that everything is abput him/her then they are vain. If you are asking if you should call them that then you should consider the question.. "is this person really my friend?" cause when you say that you don't know what their reaction might be! lol
Vaniteux
Vain perhaps.
They call him vain because he cares a lot about his appearance and always carries a mirror with him
If your friend is a boy then you call him kootkaran . And if your friend is a boy you call her kootukari.
No not at all. Not unless you either video call or are vain.
In Kashmiri, you would call a friend "dost".
call of duty 67 world in vain
In that case, my friend, you shall have sown in vain. This may or may not accrue to your advantage
You can call him your bgf as in best guy friend
You could call them a loyal or supportive friend.
a friend
Vain is an adjective--a vain man.