Sometimes I think PTSD and the baggage of abusive relationships colors the perception of all relationships. I have a good friend of mine that is helping me look at things in a more healthy manner, and she acts like my emotional barometer.
The other day we had a customer come in and he got very rude about the fact we did not have what he wanted in stock. Of course my mind goes instantly to what a failure I am, I can't do anything right, blah, blah. My friend steps out and firmly says "Sir, I can order this for you and it will be here in a few days or I can suggest alternative vendors. I understand your frustration, but that is the best we can do".
Of course he walks out because he wants it now. But she just turns to me and says "He was a rude ass". The thing is she was right. He was a rude ass and it had nothing to do with me. It was his problem, not mine.
To end this rather rambling post, I think that sometimes I have no boundaries as to where other people's problems end and my responsibility to them begins. I take on things that I shouldn't, weather it be an actual action or a feeling of responsibility. I end up being hurt by people that had no intention of hurting me and being hurt by people I really shouldn't even care about. Everybody has moments of being a jerk, I just need to learn to recognize them and learn the problem is theirs, not mine.