There are people who refuse to compromise in any way on what they want to do, when they want to do it and how they want to do it despite living with others. They consider it a relationship when it is only an arrangement.
The difference lies with one word compromise. A relationship whether casual or deeply intimate requires compromise on everybodys part. Give and take with the best interests of the relationship the determining factor.
If we find ourselves in an arrangement that no longer works we can renegotiate or end it as we choose. A relationship on the other hand has a greater degree of emotional content that can carry a heavy cost to end.
We must recognize whether we have a arrangement rather than a relationship when deciding how much we are going to compromise in order to keep it going. The second point is that we need to make sure that we don't mistake an arrangement for a relationship when placing demands on others.