''I Am A Married Mother On The verge Of Committing Adultery with Another Man, Please Help''

“I have been married for four years. My husband and I have three kids. I have a significant problem. I am extremely attracted to another man who possesses those qualities that I often criticize my husband for not having — spontaneous, quick witted, fun, exciting — all the things that life is not always about on a daily basis. My husband is also quick witted and bright, but is also very bottom line and highly focused on day to day responsibilities that are not so exciting — job, bills, etc.
I have the opportunity to act on my attraction, which I believe is mutual. My heart says to act on it, and I have mildly flirted already, but my brain says no, because I am scared of the consequences.
Is this natural? What should I do?”