considering leaving

But I don't know if I should.
My fiancé and I have a 4 month old.
He works and in a SAHM.
He complains when I want to go to the gym for an hour 3 times a week when he gets home from work, but he goes out with his friends on weekends.
We barely have sex because our daughter co-sleeps and is super needy.
I honestly just don't find myself missing him when I'm not with him. I just don't feel like I'm just comfortable in the relationship.
All I really want to do is go to the gym and workout, and spend time with my daughter and animals. I just feel indifferent to be around him. Honestly he pisses me off 90% of the time anyways. He  ever helps with the baby or housework. I feel like a single mother sometimes. 
Ugh idk what to do!!
I don't want to leave him and move back home with my mom and give up being a SAHM

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