Should I tell the man I am dating I've kissed someone else?

I have been dating this man for just over a month and will soon be going on a fourth date. I want us to be exclusive/in a relationship but not sure if he feels the same. Last night I kissed another guy and exchanged numbers, should I tell him? He is on vacation at the moment and I'm kind of expecting that he has slept with someone over there as one mention of the word girlfriend and he seemed shocked by it so at the moment I think he still sees it as a bit of fun.
Should I tell the man I am dating I've kissed someone else?
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