He was rude if he never contacted you for 3 weeks. I believe he sees you as a "summer girlfriend" or something, like a temporary girlfriend. He doesn't really care about you. If you contact him, that's your choice, but I think you will always be the "temporary girlfriend".
- Did you ask for more than to be a temporary girlfriend? How did you ask?
- Did you ask to date exclusively?
OTOH, some countries have bad phone or internet service. Is this the case with his home country?
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
(Please note, we give the best advice we can based on the information given in a post. For better advice, please include the age of all romantic partners.)