One of my DH friends kept messaging me asking to play an online game , I kept saying that I would rather stick pins in my eyes told my DH he didn't seem worried, then one evening he messaged out of the blue asking to meet at a hotel in a nearby town , I told my DH he didn't seem bothered which bothered me more.
Then I had to go on a group holiday with him, his wife and kids and he begged both of us not to tell her.
I couldn't tell her, it was way to late plus we weren't friends..
They ended up moving away and he was sleeping with the new neighbour when I was told, I really regretted keeping quiet as she idolises him.
It's a cruel world we live in.
Their are women out their that will randomly message unavailable men out of the blue I believe just as their are men that do the same.
But if you can, check his messages.
You have cause for concern why waste time , he is withholding information that you need to settle your mind.