Can someone cheat using internet and email?

I have been happily married for almost 5 years. Like most marriages, we have had our ups and downs. Just recently I have learned that my husband is put a new profile out on a dating service web site. This is actually how we met. I noticed in his new profile he is looking for someone different than what he married. Is this considered cheating? What would you do?
Thanks for the replies. I have confronted him on it. He denies it by saying that the dating service put his old profile out on their web for money and to “beef” up the number of available singles. As if there are a lack of profiles out there. I cannot take his dishonesty.

yes i think it is. i had a man in my life that was obsessed with others on the internet

Online Dating Service