John Gill Commentary Esther 5:12

"Haman said moreover, Yea, Esther the queen did let no man come in with the king unto the banquet that she had prepared but myself; and to-morrow also am I invited by her together with the king." — Esther 5:12 (ASV)

Haman said, moreover
To all which he added, and what seemed to delight him most of all, or however was a new additional honour done him:

yes, Esther the queen did let no man come in with the king unto the
banquet that she had prepared but myself ;
which he judged was doing him singular honour; and, by the joint affection of the king and queen to him, he thought himself established in his dignity and grandeur:

and tomorrow am I invited unto her also with the king ;
had been invited, not by a messenger, but by the queen herself, which was a double honour.