Why would you have to sell a house your daughter has been living? I think your daughter knows what is going on, kids are so smart but she will be ok. Sometimes the best thing that ever happened out of a marriage was to have your daughter. Let her know that the purpose of her mom and dad were to make the most beutiful child in the world and sometimes it is better to live apart from each other to be a good parent. Does he visit with your daughter or is he one of those, "if i'm not going to get my way, i'm going to ignore being a parent and dad to alittle girl who needs me?" type. Your daughter does know something, if it is not about how much he drinks or cheating she know the level of calmness in her home. I think you already made up your mind on what you need to do, just think of what is best for your daughter and you. Like you said, you have a good job, great supportive people and family around you and you are worth it, your daughter is worth it. live happy