Lets look at this from another angle. You are inferring this is a pattern. I am not sure what your illness is but could this be a sign of self-sabotaging?

I will admit in hindsight I have done this. I have come to a point where I get jittery and have begun to look for things wrong and essentially sabotaged the relationships. I went through this with my current relationship and thank goodness with his patience, some great CBT, and a very good psychiatrist I was able to work my way through it. We came to a deeper understanding, the relationship came out all the better for it.

I apoogise if I have gotten this all wrong and am out of line.