Meeting people when I have a 'compromised' skillset for understanding what people mean

My life before a minor brain injury was not too unusual excepting my time working abroad for an NGO assisting people and teaching English. My best skillset was relating with people to assist them in accomplish their goals for a better life. Now my organizational skills are poor and decision making often takes time because of a minor brain injury. People regard me as well educated and intelligent often because I have a progious vocabulary still. However it sometimes takes me an inordinate amount of time to determine which meaning of many possible meanings someone is expressing. I don't know how else to put it. I am trying to cope with these circumstances. I endeavor to believe whatever is the kindest meaning is the one to decide they meant - whenever kindness is an aspect of the conversation. Obviously, even in trivial situations people can be rude. Like if I am trying to exit the grocery store at the same time as someone else. A kind response from me can sound like sarcasm in such an instance. I don't know if I have a point. I'm considering going into therapy to develop coping skills from this situation. I don't understand why it is difficult to comprehend intent or whatever. I know the cause. I just don't understand why relating is more challenging. It doesn't seem that presuming everyone is kind is a useful presumption. I have made a new friend and been in two long term relationships which were disastrous. All three people were extremely self-interested. My last relationship was with a very manipulative, abusive narcissist. I'm not sure why I attract such people. I don't know what I am doing wrong but it has only been a problem after this brain injury. Life before was fairly commonplace. Plenty of friends - and still have them. Never had problems dating. A marriage that lasted over two decades. (It ended before the brain injury). Now I think I just attract the more extreme types of self-interested people. And I don't see how easily I am being controlled until after a while when I realize the person has been taking advantage of me or constantly making me feel bad. I imagine emotionally abused people feel the same way. Anyway, peace!