hi gillian
from what you have written here i do not find that you are in the wrong. it sounds like he is taking advantage of you and always has. flirting with other women does not sound like he has ever been committed to the relationship. you may have to take legal action to have him removed from the home. welcome to psych central. you will find we have several forums where you can post about your concerns and receive feedback from other members. you will get a lot of support here. again, welcome