Is is OK for a childhood friend of the opposite sex to come and stay with your significant other?

I have been with my fiance for 6 years. He has a childhood friend coming to stay with him for 4 days. I've never met her or spoke to her. He claims she is like a sister, but I feel it is inappropriate for her to stay. What do you think?
By corn 8 years ago :: Friends
  • Rafael Morales
    MA-MS, MHT-MHRS
    I have extensive training and expertise in clinical, counseling, transpersonal/integral psychology and coaching. I provide support to those willing to work on themselves… $2.75/minute
       4.84/5
  • Milton Mankoff
    Ph.D.; LMSW
    Misunderstandings can create or escalate conflicts, but genuine incompatibility can also exist within relationships. Non-judgmental. LGHBTQIA-supportive. $2.75/minute
       4.92/5
  • View More Experts
    13