I’m trying to decide if I should be upset or not

I have a 5 week old who eats 4 oz around every 3.5 hours. Well he went to his dads house and my bf said he was acting like he was still hungry so he gave him another 4oz! I told him try 1 oz not give him a whole other feeding. So he has 8oz in less then an hour. The baby is back around me and he seems ok he spit a little bit twice. I also pump so I lost out on a feeding when I’m barely keep up. And now my schedule is thrown off because idk if I should feed him at his usual time.

Idk if I’m in the wrong for being upset since the baby seems fine. If I am then I guess I’m just using this post to vent my frustrations.