Should I have to pay my ex boyfriend 750 a month to help him get further in life???

So I’ve been with my boyfriend for 3yrs we have a 2 year old daughter. During the 3 yrs he has cheated on me. Spent thousands of dollars on girls, asking for naked pics and videos. He had a whole secret life. I’ve been a stay at home mom for 2yrs. We broke up and I’m still living with him cause I don’t have a place to go. The agreement we had was once a get a job and save money I’ll move out and find my own place. Durning our relationship my ex said it’s not his responsibility to pay for my car, phone, or any bills I have. We were engaged btw. He told me it’s my parents responsibility to do that. So durning our relationship my dad paid off my car, fixed my car when it broke down, paid off 2grand that I owed unemployment. And my fiancé at that time did nothing but give me a roof over my head and sometimes food. Most times he wouldn’t even buy food. Anyway now that I got a job he wants to pay 750 for bills. Cause he said he wants to get himself out of debt using my money. He wants to start his own business with my money. And we are broken up. Am I wrong for not wanting to pay to better his life. When I don’t have anything. I don’t have a bank cause I owe money, I don’t have my license cause I need sr22 insurance, I’m in credit card debt. He never once wanted to help me. He spent thousands of dollars on girls but told me I don’t deserve a penny. So why should I help him when he doesn’t want to help me and his daughter?