<<And I wonder sometimes how I could be so "stupid", I guess, to still like someone who has been so awful to me.>>
<<Dogs still love their masters who kick them...for instance.>>
<<It's why I don't really trust "love" that much anymore.>>
Oh, Jane..... your words concern me. I wish I could give you a hug. You are not stupid. You are living by the choices that you have consciously made -- to live as roommates for the sake of your family. It is my hope that your remembering that will give you a sense of personal power and comfort.
It is always in your power to choose.
As far as emotions go .... well, hell.... they go all over the place. (Now how about some chocolate?) 
Jean