I'm sorry you ended up in this situation, i had a similiar experience but it was with my sister, i don't know if that counts, she walked all over me our whole life, until i put an end to it in the 1980'2,in our 20's. We were close sometimes but i don't know why sometimes she would treat me like a doormat especially when friends were around. She ended up saying bad things about me to both of our friends and i lost alot of friends because of things she told them about me, that weren't true.My husband tells me to look out for number one-myself first, but that is easier said than done.