People take advantage of me for being too nice
I have no control over my ‘niceness’ when I talk to someone in person. Inevitably, I see the patterns of manipulation emerge. I clearly see what they’re trying to do because the person they talked to seemed stupid.
Then, through communication by email or other action, they get a completely different response from what they were expecting, resulting in anything from a minor inconvenience to serious damage or loss on their part.
Sometimes I feel bad about it because I should set expectations from the start, but I’ve never lied or broken a promise.