When relationships fail because of a lack of trust what's the best way to deal with it? Do you try to explain or do you let them assume without knowing the facts? Would you let go?

If there is no trust has to be a reason there is not any in my opioin its better to let it go..

Honestly is my answer for the first question. Second one...you know what they say about assume? Makes an *** out of you and me...better to communicate your intent. Third one...depends on if you love them and how long you've been together.

Trust is important in a relationship. Some believe once it's gone, you can never get it back. I disagree. Both have to acknowledge there is a problem though and want to fix it. This isn't easy but it can be done.

Good luck to you whatever you decide.

If it's still possibly to have a decent conversation, I think I'd give it a whirl. But then it's important to not point fingers. You can explain how it works for you or what actually happened from your point of view, but steer clear from trying to blame the other person. If you do that, they might get defensive and you're attempt to explain will fail.
Also allow for the other person to tell her side of the story. It is possible to work it out, but both must be willing to communicate (which also means listening to each other)

Well, if you were strong enough to endure no matter how hard it got, it`s her fault basically, then you can just move on. You can still be attached emotionally, but it will pass with time.

For myself and my experiences no trust no relationship.

In my own personal experience I believe that it really depends on the two people involved in the relationship. In some cases, trust is impossible unless each partner is willing to understand and work with each other. It may be that either partner may have had an experience where trust was betrayed or was suspecting that trust was betrayed. In this case, if the other partner is willing to communicate and truly understand the past experience of the untrusting partner, he/she may be able to work at building their trust in the present relationship. Opening the lines of communication is key. Willingness to understand the insecurity felt by the other person can be worked through, but it takes people with a special compassion and empathy to work through it. People who don't really care about the other person's feelings, will not choose to understand the distrust issue of the other partner. Trust does not necessarily come automatically, it is developed over time, which too few people want to give the untrusting partner. This results in a no trust/no relationship situation. My humble opinion only.

I think there is truth in what everyone has stated so far in this discussion. The older most people get, the more baggage they bring along when entering into new relationships. Trust has to be built with each new relationship. For me personally, I have to stop myself from looking for distrust within the new relationship because of what happened to me in the past. I am working on it.

To answer the topic question, I would say give the other person time to build trust with you. Neither is perfect but after enough time has passed and both within the couple have proven their trust, then if some undeserved distrust remains, then let it go because the relationship will not work.

Thanks for all the reply it now gives me some choices and decisions.