I think any relationship that doesn't have trust, has issuesJust my experience. I'm a once bitten, twice shy type of person but I always trust 100% until there is a reason not to. Thankfully I've never really had any issues there but if that trust was lost then I'd guess the relationship probably would be too in my book. I've found that people have a habit of repeating mistakes. That might mean that they violate your trust or that you find the same kind of people time and time again. It's a vicious cycle that is partially because of environmental factors and life decisions have helped shaped who you are and what you look for. The same is true of the other person. It's pretty hard to change hardwiring in your brain. It *IS* possible but highly unlikely.
Regards,
B