Maintain as much very regular contact as possible, especially by voice. These days it is realatively inexpensive to call long distance, even internationally. Email contact can be daily, and it is always wonderful to see that there's a message waiting in the in-box from a loved one. Save your money and travel half way, or all the way, to meet up from time to time. Occasionally send little gifts and reminders of you. However, up to a point, I do not believe that (long term) absence makes the heart grow fonder, usually.
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