Ugh, Help!!

So my boyfriend comes home from MCT (Marine Training) on Friday he was gone for a month and I’m super excited to see him! He goes away again on Jan 3rd for 2 months and I’m not looking forward to that. My friend will be on winter break from school for a month and she told me she has nowhere to go and she asked could she stay with me. She goes on break the same days my boyfriend will be home and I want to spend as much time with him as I can before he goes back & I want to have an open schedule with no distractions. Also if we’re being honest my friend is a hoe and I’m one of those chicks that wouldn’t dare to leave a female around her man. Not because I don’t trust him but anyways what’s a nice way to tell her that she can’t stay with me because I already told her she can but I wasn’t really thinking it through and now I don’t want her to because I really missed my man and I want to spend as much time together before he goes away again without making it seem like I’m putting my man over my friendship.