BF/GF breaking up who stays who goes?

[Chris Hart]

I just received a call from one of my tenants stating he can no longer live with this GF. They are both on the lease. He makes all the money, she doesn't have the money to afford the place by herself. They both want to stay but I don't see how she could afford it by herself. The BF says he is nervous she will fight to stay. Which to me sounds like I may have to evict her if he cant get her to leave and he has to leave. What is the best way if possible to remove her from the lease or get her to leave? I'm open to any other experiences or suggestions. I live in Connecticut I know each state has different laws. I told him to give me a few days to get back to him as I have to see what the best course of action from here is. 

Thanks,

Chris