To end in "good terms" but he tells me he misses me?

Anonymous
I ended a relationship because he went to other country to study. We got an amazing breakup: full of good wishes and open to keep in touch and being friends.

I have been very firm, sending memes sometimes and given him a call, but not a daily talk as we used to. He has been gone for almost 2 months and sometimes he tells me how bad he misses me, but that ends always me telling him I miss him too and then noting. like we can't change our situation as an ex couple because of his studies, but having this feeling of "not leting go" but also don't saying a word later.

I'm confuse. How should I react?
To end in "good terms" but he tells me he misses me?
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