Should I mention it?

A close platonic friend of mine is in a relationship. He and his girlfriend have had trouble for years but they have remained together.

I recently signed up on a dating app, but I don't have a photo. Yesterday I received a message from my friend. He doesn't know it's me. While I knew he was cheating on his girlfriend, I didn't know he was on dating sites.

Should I mention he messaged me? I don't want to make things awkward or embarrass him. I feel like it is something we can share with each other. However, I wonder how he would view me if he knew on was on that site.

Should I mention it?
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