I honestly don't think that this is something that other people can help you to decide. Some people will always say that you only have one life and you should live it as fully as you can; and others will insist that you must stick to your marriage vows.
Neither point of view is really relevant, as it is what you think that matters.
How well do you know yourself? Are you likely to feel resentful if you stay faithful? Are you likely to be wracked with guilt if you don't? If you have an affair, will your husband accept it (some do), or will it be the end of your marriage? Is there someone waiting in the wings to be your lover? Is he married himself, and if so, what impact would this have on his wife?
All of these things are really important, and IMO you need to be absolutely clear about all of them before you do anything. Whether or not strangers online approve or not is neither here nor there.
Whatever you decide, I wish you happiness.