I think I'm not going to let my kid's dad come see her when she has the flu
That sounds like it's a reasonable request because the flu is very contagious.
I'm sure he's the one who gave the flu to her and he will give it to me
You should not keep your child's parent away. Maybe you can distance yourselves and be extra careful when you visit.
So, I should allow that loser to hurt other people in my family?
No, and I feel your frustrations, but the dad isn't sick at the moment, so maybe he can help you with the sick child. It takes a lot of responsibility and care for you to be by yourself. I know you are a great mother, but even the best of mothers can use some help.