So not every best friend is a true friend, so keep your girlfriend away from her decisively. I hope my sharing can be useful to you. But as a boyfriend, there is nothing wrong with you persuading her for her sake. Whether you do it or not depends on your girlfriend. If she doesn't agree, it means that there must be a disagreement in your three views, and there will be many contradictions in the future. She won't listen to you. This requires her to realize the seriousness of this problem, so she will choose her friends selectively.
If you don't want them to associate, you should analyze the reasons why you don't associate with her and make her accept it. Will roll up your sleeves for me and others and lift the bottle to the dry rack, and you, what have you done for me? No matter how high-sounding the reason is, no matter how high-sounding the excuse is, it is an absurd act of covering one's ears. Why don't you let your wife misunderstand? You can only cancel this operation! If you want family harmony, don't look for eggplant! It is you who have a best friend of the opposite sex. You must be very happy. You must have a girlfriend who can relieve boredom and live a happy life.
You are afraid that your wife will misunderstand you, which shows that you still have a conscience of liking the new and hating the old. Try to kill two birds with one stone! If you want a home, go with your daughter-in-law; if you want a girlfriend, go with your girlfriend. This is very simple, just think about what you want! You shouldn't go out with her alone, and your wife certainly doesn't want to. In order not to affect your feelings, you'd better refuse her to go with you.