How to deal with the relationship between three girlfriends

In my opinion, if three people are sick, I especially hate it. If you used to have two together, you might be a little jealous. After all, if two people determine the relationship, they will definitely get better. But suddenly you are the one among you, that is, if you are a third party, you may just think that they have a good relationship, and suddenly you are cold. I don't like the feeling of three people anyway.