P.M.
I breastfed until child weaned herself at 4.5 y/o. It's time to teach nursing manners. "Wait", "when we get home" and "Later" are all good things to teach.
Stop pumping too... no reason to still pump for a toddler - tho nursing on demand is good. Try not to refuse outright too often, but teach him those 3 above manners and you'll be a happier Momma.