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I love you but leave: evicting a good roommate

I'm a grad student, and I currently live in a flat with another grad student, who's been living here over a year.

The problem is, my boyfriend will be coming back into the country in a few months and would really like to move in with me. I'm trying to find a supportive, non-pressuring way to ask my flatmate if she can commit to moving out on a particular date so he can move in…How do I work this?