Want the C to be the reason for my feelings

Someone said to me today something along the lines of, “I think I’m creating these feelings with my thoughts but I want it to be something else that is creating them.”
I thought, “me too.” This especially comes up for me with C’s that involve my ex. Other C’s I’m able to manage my mind more, but when it comes to him it’s a mess in there. I had the thought that he – and his family – are my kryptonite – and then I wondered if this was possible. Is it possible for a C to make you weak? I’m guessing you will say no, but why it is that I feel so strong in some settings even when the C is “adverse” and I feel “weak” in the presence of other C’s. I notice we all seem to have different areas of weakness and strength.