Not EXACTLY like that (as in the "never met irl" part, and it doesn't really focus on the long distance aspect), but something similar if you haven't read it already is: https://www.mangago.zone/read-manga/raion_gotoki_no_kuni_kara/
Love interest is an exchange student from Africa. He moves back to Africa after the exchange, and their relationship is long distance from then on. They take flights to see each other every now and then, but they remain mostly long distance, with neither of them immigrating to the other's country. A little bit of racial stereotyping, but it's very cute and fluffy.
That's the only thing that really comes to mind for me, sorry. I hope someone more experienced in this genre helps.
is there like a YAOI/SHOUNEN AI story where they're in a long distance relationship? never met irl, only chats/video calls...