ANSWER:

You have one of two choices:

Either give them your phone number and talk to them so that you won’t hurt their feelings but end up burning in hell for your sins.

Or

Save yourself from hellfire but not giving them your number nor talking to them and giving them the impression that you are rude for not doing this.

So basically, it is your choice whether to burn in hell or not! 

Salam, this happens rarely but sometimes girls my age ask me for my phone number and try to talk to me, i dont want to hurt their feelings so i give my number and talk to them as well. I know its sin but i dont want to make anyone sad pls help me