Why won't my boyfriend move out of his parents house?

My boyfriend and I have been together for 6 years. We have had our own house once before. Currently we are living with his dad and step mom. They are moving out of there home, there for we have to move also. I already have a apartment lined up for me and my boyfriend but he will not go with me because there isn't enough room for his parents. Why? He has a good job and the rent is cheap. I told him that he was eventually going to have to chose me or his dad. Was that wrong? Someone please help me...
Why won't my boyfriend move out of his parents house?
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