I am an oversea student studying in London. I met this girl on tinder, she is a local. After chatting on tinder for a while, I asked if she has whatsapp. She said yes, and asked for my number. So I gave her my number, but instead of adding me, she replied, 'oh, that is a number from (my country)'. I replied, 'yes I keep my home country number. Are you thinking that I will not be staying here for the long term as I use an oversea number?'. She did not reply after. What did I do wrongly?