The baby ate 90 ml of formula and has been breastfeeding for 1.5 hours…

The baby ate 90 ml of formula and has been breastfeeding for 1.5 hours without letting go. If I remove him, he cries. Can you tell me what to do? Before bathing, I fed him breast milk at 7 pm for 10 minutes, and then bathed him after 9 pm. Since he didn't get a sippy cup right away when he cried at 8, I think he got stressed and now he won't let go of his breast.