I guess I didn’t answer the question as it was worded (sorry!).
I have been in relationships where one or both of us had issues with trust or acceptance. There is a lot of pushing away, then asking for another chance, and repeating the cycle until one has had enough.
My issue was never accepting that I am loveable because of a history of childhood abuse. That was the also the case for the two men in the longest relationships I’ve had. When we don’t feel worthy of love, we always second-guess the other person’s motives for being with us— “what could they possibly want to be with me for?”; “Either they are taking advantage of us in some way, or they are passing time until something better comes along.”—and so we wait for the proverbial shit to hit the fan.
Or, since we assume that the relationship is doomed to fail anyway, we subconsciously sabotage, by nit-picking at every little thing we can find to justify why we were right. Or we simply don’t give the relationship our best effort, and screw things up as if we don’t care; but then we realize that we do… it’s all a vicious cycle and self-fulfilling prophecy rolled into one.
Breaking the cycle is something that both people in the relationship need to be a part of, and counseling to improve communication could prove quite beneficial. As I said before, it is difficult to stop yourself from reacting almost instinctively to those emotions that have such sensitive triggers. But as soon as you recognize what is happening (and hopefully before serious damage is done) you have to stop yourself immediately and really pick yourself apart.
Very early in my last relationship, I was in a position to offer a loan to the man I was dating. He had made an error in judgment in trying to help someone else, and needed a short-term solution to avoid fees from his bank and such. He had always been the knight-in-shining-armor, so he took offense at the idea that he should borrow from me, even on a very short term. I felt rejected when he refused the loan, because I was accustomed to being the one to make things all better. I left in a huff, and when I realized that I was reacting rashly, he refused to talk to me.
It took about a week, but we realized how we had both over-reacted, and we did get back together. But after that, he was always finding fault with something but act as if all was well, then dump me without warning, claiming that the issue had been ongoing. When I would explain and demonstrate how the issue could be resolved with communication and compromise, we would try to reconcile, but a couple months later a new ‘issue’ came up. We were together for about a year before it became inherently clear that trust had been eroded to the point of no return. It still hurts.
But throughout all the sturm und drang, I managed to stay fairly level-headed after that initial tiff, because I recognized how I had let my emotions control me and had ultimately shot myself in the foot. So after that, I made a conscious effort to contemplate the origin of my feelings before choosing what actions I took. I really surprised myself and although it is sad that the relationship did not succeed, the lessons learned were priceless.