Summarize this article:

You probably don’t want to hurt anyone’s feelings, so you might adjust your behavior sometimes. However, a toxic friend may make you always feel like you have to be careful around them so you don’t upset them. Recognize if you feel stressed and nervous around your friend because you never know how they’ll react.For instance, you might keep your feelings to yourself so your friend doesn’t get mad. Similarly, you may go along with what your friend wants so they don’t cry or accuse you of being mean.

Summary:
Notice if you feel like you’re always walking on eggshells.