Is consenting to a virtual marriage proposal in an electronic game—for the purpose of playing, not actual marriage—considered a real marriage that necessitates divorce?

It is important to warn against the impermissibility of a woman communicating with a non-mahram (definition) man without a legitimate purpose, and one must repent from such acts. Your agreement to the aforementioned invitation does not constitute a marriage contract, as marriage in Islam has essential pillars that must be met: the presence of the woman's guardian or his representative, along with two just witnesses, a dowry (mahr), and a formula indicating the marriage contract. Therefore, you are not married, and a divorce is not necessary due to what you agreed upon.