Am I overreacting, or is my child’s father not pulling his weight as a parent?

I have a full time job as a nurse and a 3 year old autistic son. His father, although he wants to be in a relationship, decided to move out as he felt I was not allowing him enough time to focus on himself and his goals. He stays with him at my place usually 3 nights a week and sometimes a few hours on the weekend as he states his current apartment isn’t ready yet for our son. He has multiple side business and a full time job that takes up a lot of his time. Since finding out my son was autistic, I decided to stay with my parents for extra support and in order for me to be able to maintain a job; however , my mother works and my dad is retired but is usually busy. Additionally, I recognize my child is my responsibility so I don’t just throw my son at them every chance I get. The issue is, is I’m exhausted. I work four days a week, I have a pretty long commute, leave my house around 7 come back home 6:30pm and go straight into mom mode all while my “partner” is out apparently focusing on his side businesses and living elsewhere. He also has a tendency to tell me he will be there for a certain number of days and ends up going back on his word and only staying around for 2 nights as opposed to three, for example. He says I need therapy for getting annoyed and I should consider myself lucky for him being as involved as he is. What type of men was he around to model his current behaviors and believe that how he is going about things is beneficial to me? I really need advice. He doesn’t seem to get it or care about it my time for myself and says I need to be more selfless because he has goals he wants to achieve.

Am I overreacting, or is my child’s father not pulling his weight as a parent?
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