You shouldn't overstay your welcome.
Wendy and her partner own a home together and are going through a rough patch, so she's been staying at her friends house.
Wendy wants to avoid going back to her house.
Wendy decides to leave her friend's place and stay with her parents for awhile.
Wendy continues staying with her friend even though it's been a long time already.
Wendy's friend is relieved that she is going elsewhere, so she can have some personal space again.
Wendy's friend is feeling like she has a lack of space with her there.