Are y'all together? In theory? Sounds like you need to make it crystal clear to him you've broken up. I assume you don't live together?
Absolutely not. You feel used and you just had his child.
Him stressing you out & not being supportive is damaging to you & the baby so no it’s not petty! You are doing the right thing
You need to be good for the baby, he needs to grow up. Do you. ♥️♥️