However, if one spouse spent money on gifts, trips, and other expenses related to his or her infidelity then the Court may find that the just and equitable division of the marital property involves providing more of the marital assets to the spouse who did not spend the couple’s money being unfaithful with another person.
The above is most certainly true. But this isn't really dividing assets unevenly for the sake that one person is a cheater. Half of the money spent on an affair partner's belongs to the betrayed spouse. The cheater doesn't get to spend the BS's part of the money as they see fit.
If the WS didn't spend anything, of substance anyway, on the affair partner, infidelity doesn't have any other bearing on splitting of assets other than what the BS was already entitled to.