@hr336783,
Paper. Pens. Stamps.
Write letters. And don't define anything until you're together again (I agree with you - I'm not a fan of defining much of anything until parties are face to face and there is less wiggle room for misinterpretation).
Letters don't have to be long. It can be cards or postcards with just -
saw this and thought of you. And then you sign your name (not
affectionately, or
fondly, or
love, etc.).
Letters are wholly unexpected these days. They are sweet, romantic even when not a lot is said, and they have a permanence to them that texts don't have. Be prepared for guys to write very little and not that frequently. But there's no reason you shouldn't write. And don't take a lack of answers as a lack of interest. You might write a letter and get a text back - and that's fine.
But try it. It's cheap and it can convey a lot or a little.