Super agreeable nature is unsettling. Often makes me wonder what's going on, what the person wants from me. When there's lack of boundaries, it's likely that the person feels either so lonely that they'll reach out to anyone they can, or they really want something from you. I pity their situation, but still, I don't think that people like that realize that they can weird people out when they get that way.
“Thoughts are the shadows of our feelings -- always darker, emptier and simpler.”
― Friedrich Nietzsche