Boundaries are different for every individual and every relationship. They help define your sense of self by separating your needs, desires, thoughts, and feelings from those of others For example, you might not want to share your family problems with your coworkers, however, boundaries with your best friend might be more flexible.

When someone crosses our boundaries, we can be hurt. Crossed boundaries can create strong feelings of distrust, anger, sadness, frustration, and fear. Know that whatever you may be feeling because of a crossed boundary is completely valid, but also know how to communicate with the person about how you feel and establish clearer boundaries so that it won’t happen again.

You can begin setting boundaries by practicing healthy communication. When communicating, make your message clear and understandable. Talk about what is happening, how that affects you, and don't be scared to open up about your wants, needs, and feelings. 

Communication goes both ways. Good communication involves you taking the time to really listen to whoever you are trying to build a healthy relationship with.