My question is, can you fall in love just through correspondence? I am doubtful. Perhaps you can but I would be one of those people that would choose not to.
I wouldn't be here if not for correspondence. But - my parents first met briefly at a wedding - then corresponded almost every day for at least a year and fell in love in their letters. It cost about 3 cents to mail a letter in 1946, but a penny was worth something.
Correspondence is great. I used to send a lot of letters, especially hand-made holiday cards. Support the post office! Did they get to see each other in between their initial meeting and - I guess - I don't know, the marriage? Perhaps an in-person engagement or something? I believe you can get to know a person through correspondence, for sure. If your connection continues to work in person then that's great. I was absolutely mad for a boy for years - he wrote the most beautiful poetry. I loved his brain. But we had terrible conversations, unless we were talking about poetry we didn't seem able to get the ball really rolling on the conversation. My massive, obvious crush - idoltry - may have been a factor here. Or maybe for whatever reason we just didn't jive conversationally; I know he was somewhat interested in me, over the years. But it was one of those situations where neither of you offers up or feels like you have much to offer up about your day-to-day life. Different circles. Ah, ha, I don't know. I shall endeavor not to idolize someone just for his poems, his brain and his bad relationship with his father going forward though. Well and his beauty. ;)