I'm going to eat the last cupcake instead of saving it for my husband like he wanted.
Why aren't you saving it for your husband?
Why would I even care about his feelings? He's nothing but a dirty pig.
Ordinarily, it is a nice thing to be considerate of others and save the cupcake for your husband.  However, it sounds like he isn't a nice person.
I don't trust him anymore.
Maybe you should talk to him about what is bothering you about him. He might not know what he is doing wrong.