Postcard?!

A guy from work that I've known for 2 years left at the beginning of summer to go to London for a summer semester abroad and just the other day I got a postcard in the mail saying "I wish you were here instead of at work. Cheers, Tim" we began talking more before he left and I was joking around about how he should send me a postcard if he has a chance and he did. What does this mean and what should I do?
Postcard?!
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