when is the right time to stop believing in someone?

I am a person who gets very easily attached to people. From the moment I meet someone I click with, I plan on being friends with that person for a very long time. I have been friends with two of my very best friends since middle school, and I don't plan on getting rid of them any time soon. However, although this desire to keep friendships at any cost can be a strength, at times it leads me to my greatest moments of weakness.

I am not good at letting people go, even those that I know are toxic for me to keep around. I would rather let a person hurt me over and over again than feel the pain of cutting them out of my life and admitting that our friendship isn't meant to be. Quite honestly, it's an awful personality trait to have. The reality of this, is that I often don't get out of relationships until they run me into the ground. I want to see the good in people so badly, that I lose sight of the fact that some people just aren't meant to be in my life.

This brings us to the answer to the question I asked above: The minute you start questioning whether or not a person is healthy for you to have a relationship with is often times the moment that you need to start moving on. If someone is giving you reason to think that their relationship with you is taking more out of you than it should, that's the first red flag. There are only so many times a person can walk all over you and make you question your relationship before it becomes too much on both ends.