breastfeeding problem

So I have a TON of frozen breast milk as I was pumping every 2-3 hours for 2months. (Son was in NICU). Now I have him home and when I try to breast feed he will latch for a couple minutes and would fall asleep. And sometimes he is really fussy and can't latch at all. I feel because he falls asleep he doesn't get enough and wakes up a lil after  hungry. What I was really trying to do was breast feed during the day and at night offer bottle. What should I do? If I stop he still getting breast milk but we don't get the bond.