My ex is getting married and invited me to a wedding banquet. Should I go?

go, why not? Since the other party can invite you, it proves that the other party has put down and wants your blessing. If you really like and loved each other, then you should bless each other.

Be generous, don't lose your proper posture, and don't get entangled. If you really have a fate, you might as well attend with a little expectation, but don't be destructive.

of course, if the other person still has some contacts with you and you both call each other again, that's another matter. So show your own demeanor and don't let those people laugh. After all, if you can face them with a smile, then you must be more generous than your predecessor's marriage partner. At that time, the one who will be laughed at will be the marriage partner.