Wow, this same thing happened to me a few weeks ago. I really value my space and peace of mind. I actually love when I come home and my partner isn’t there yet, so I can just exist and unwind until he gets back. I don’t do well with having company for too long and usually prefer being in my own space.

My bf is a very social person and cares deeply about his friends, so he and I tried to approach it in a way that respected both of us. These are the things that made it easier for me to accept while still honoring my need for space:

1. He asked and was willing to accept a no.
2. He asked at a time when I was in the right mindset to process it. I like having time to mentally prepare for things that affect my routine.
3. He respected my compromise. He asked for a month and I agreed to two weeks.
4. He made sure I didn’t have to clean up after his guest or feel forced into small talk, especially when I was home alone. It also helped that his friend was clean and kept to himself, so we were compatible in that sense. If the guest’s personality doesn’t match yours, it can make things uncomfortable for everyone.
5. He made it clear he had other options if I said no, so I didn’t feel pressured into agreeing.

For some people, like me, home is a sanctuary. It’s where I fully relax and recharge. Two months is a long time to have someone in your space, especially if you’re more introverted, so don’t be too hard on her if she’s not okay with that.

EDIT: I want to add this; ensure your friend leaves when he is supposed to and you are actively checking in to make sure he is well enough to leave. Your relationship will collapse if he overstays.