Their "relationship" started with Tully saying that Jade was using Drew. A nominations night came up - Jade was nominated, and Tully was not, she took Jade's "bed space" that night. From that moment, she yelled at Drew every time he spoke to anyone other than her, accusing him of talking behind her back. That is not love. She even went as far as projecting her tantrums as being him throwing tantrums.
Yep, her and Tahlia aren't married, but they have lived together for a long time and have a dog together so they aren't a "married couple". And unfortunately same sex marriage is not legal in Australia. I am Gen Y - gay or straight, if you have a dog together, that is the same as having a child together. Given they live together, Tully is clearly assuming once she leaves the house she will just go back to their home together. Imagine Tahlia is a man who Tully is married to and has a child with, because that is basically the situation - is it still ok?