What to do if your guy friend starts behaving formally with you?

Okay so my friend and I are very close but we only text each other once in a blue moon. Last year I didn't reply back as much as I usually do because of Covid and just anxiety in general. And now my friend is behaving a little formal with me (it is understandable) even he suffers from anxiety. Now I really don't know how to break the ice. Please help me out
What to do if your guy friend starts behaving formally with you?
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