ah, no one answered this post! sorry.
why don't you just call him and ask him how he's doing? I wouldn't say "I'm seeing other people" because the assumption is that you are unless you are going steady, engaged, an item, etc..
Maybe something is happening that you think he'd like to be a part of; call him and invite him to ... an art show, a ball game, whatever it is that you share an interest in.
I'm sorry you had to wait a month for a response.
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