<human>: Provide a brief overview of the text.

So, her and I moved in together a few months a go and since then it has become common for either of us to have visitors from out of town staying for short periods of time. I set a clear boundary right away that never more than 2 people at a time due to space constraints. 

Recently she asked me if two college friends and her university ex boyfriend from a year ago could visit and stay a week, starting on december 26th. 

This of course seems extremely weird to me. I don't enjoy it when my girlfriends live in the past. She says he is just a friend now and she has absolutely no feeling for him whatsoever.   I told her that this is really not okay and she and I have bounced back and forth on the issue. 

Flash forward a couple weeks and I make it clear that this is really not okay. She tells me that she is going to tell them to stay in a hostel. I tell her that helps but I am still extremely unhappy about the fact that our first Christmas and new years together are going to be interrupted by an ex and her other friend. The third person had to bail last minute anyway.

We both claim to love each other but for me this is a serious red flag, possibly even a deal breaker. I don't want to be controlling but I don't know what to do.
<bot>: girlfriend has most recent ex and another friend coming to visit and has apologized for thinking its okay for them to stay at our place, but still wants to see him/them during our first Christmas holiday and New Year together.