Should I stay in a relationship that my girlfriends sometime bring a guy home?

I have been with my girlfriend for six years, living together. We have built a nice home together. I work and sometimes she works. We have built a nice life together. I do not like coming home and find another guy in our house having sex in our bed. Please give me some advice. Thank you, Russell

Should I stay in a relationship that my girlfriends sometime bring a guy home?
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