Boyfriend/BD Problems

Hi everyone I have a soon to be 4 month old munchkin with my boyfriend of 3 years. I’m 20 and he’s 22. During the last 20 weeks of my pregnancy he decided to go on vacations and leave me home. After our son was born he left again to open up a business in another country, basically he’s barely been around. I’ve invested thousands of dollars into the business for it not to be opened up. Keep in mind that I’m a full time student also; he doesn’t even helped me with our son financially and when I need help with watching him he catches an attitude. He’s constantly asking me for money and is always worried about what is in my bank account. Back in august his friend totaled his brand new car and didn’t give any money to get a new car. My “boyfriend” asked me if I can get a car and put it in my name and initially I said yes, but as time went on my gut and my heart is telling me no because of how he treats me. He calls me selfish because I don’t come to do doordash with him at night. We have a baby together and he’s my #1 priority and I’m not driving at night and risking his safety just because my baby daddy wants to do doordash UNDER MY ACCOUNT. I’m just at a total loss because I have some so much for this man and supported him but he hasn’t done anything for me. Am I selfish for protecting my credit and protecting my son? I raise our son by myself because he didn’t want to get a place together because I wouldn’t be able to pay my half of the rent, but he decided to go on vacations and ask me to help pay for his plane tickets and Air BnB which I stupidly did. I feel as if since I started standing my ground he has been horrible to me. Am I wrong for not helping anymore?