Confused 🤷🏻‍♀️

So my little one is almost 10 weeks, I was breastfeeding first then started pumping and giving with occasionally giving formula if we were out or topups.

Recently maybe 2 out of 8 feeds a day when he starts to have my expressed milk (exactly the same as before like from fridge and warmed) he just cries like soooo much till we stop trying to give him. Then if we give him formula instead he drinks.

I don’t know if it makes sense or it’s a coincidence or my milk is think or my diet is bad but I don’t know what to do?

Any suggestions?

I’m considering to fully switch to formula if he’s not happy. But I don’t even know if this can be changed like can it be my diet or something?