As others mention as think it's where we are self destructive. That can manifest in a lot of ways.
I've have relationships where I simply don't manage the little problems until they become so big that I just have trouble dealing with it, especially not artfully unwinding all the past issues and 'managing' each others feeling over it.
It's the feeling that you could have had something much better but for your own fault. At times you were expecting it to fail earlier which just makes it that much harder when you do try to work it out.
As others mention as think it's where we are self destructive. That can manifest in a lot of ways.
I've have relationships where I simply don't manage the little problems until they become so big that I just have trouble dealing with it, especially not artfully unwinding all the past issues and 'managing' each others feeling over it. It's the feeling that you could have had something much better but for your own fault. At times you were expecting it to fail earlier which just makes it that much harder when you do try to work it out.