Help baby refuses bottle

Glad

Hey my son is 8 weeks today I have been breastfeeding only and I pump too for later when I go back to work ... I have 6 weeks left and he refuses to take the bottle with breast milk I tried dr Brown, avent. Nuks, tommie tipee muns and he still crys like crazy I can’t leave him alone with Dad or grandma he only wants the boob am worried he will never learn

What should I do