what if your ex- girlfriend/ boyfriend re-appear

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I was walking alone in the mall when suddenly somebody tapped my shoulder and when I turn to see who is it, well its my ex girlfriend smiling, saying hello, I had love her so much that even if we got seperated I still longing for her, not to say those things we shared in the bed, she's married and I too. we talk a lot that day, and actually she says she missed me so much, and I replied thesame, well nothing wrong happens on that day, but shes kept on calling me to meet again, what troubled me is that we're both married and already have kids. For you, do I should accept this kind of invitation?