Goblin Lord only saw those under his command as pawns to use and nothing else. He prioritized himself above them. He is shown treating his subjects poorly, decapitating a fellow goblin in his nest for so much as protesting of his failed invasion.
Goblin Lord, regarded him as the one who ruined his plans and had every intention of killing him.
Goblin Lord thought that she would be as gullible as every other female adventurer he came across.