Possibly exchange something that is special to each of you, maybe write a heartfelt letter, try to keep in touch and possibly visit one another in the future. Don't make it a goodbye make it more of we will see each other again and make a pact to try and stay in touch - become penpals writing letters, emailing, texting etc.
you say goodbye in French
You can say "خداحافظ دوست" which is pronounced as "khodahafez doost" in Farsi to say goodbye to a friend.
Kra adamfo
I did not get to say good-bye to my friend. Good-bye Jack!
Um, no.
Adeus, meu amigo
call them.
bye my dear friend i miss u
Dovidenia? I think, but I believe this is formal, I'll have to inquire with my Slovokian friend how she says goodbye.
I don't really understand you question but just simply tell them how you feel, keep it simple and say goodbye.
she could be uncomfortable with affection.
Adeus, meu doce amigo.