My partners best friend is a woman, whom he has known for years (20). While I am new into the picture and I understand that I must accept this fact, it is a bit uncomfortbale to understand how they need to be in touch with each other almost every day (keep in mind that we are late 40's) and that they shared everything. His friend has not done anything bad to me but at times I think his friend has taken advantage of this friendship (in various ways) and that somehow she recents the fact that her friend has a new person in his life. For a while, they were apart but now they are back and doing things together. We are planning on moving together and my concern is how I need to handle the situation? Friend has keys to the house...