Trust and faith work hand in hand in relationships regardless of the depth. No doubt, many components of relationships can move it forward or backwards but trust and faith drive both the longevity and fidelity of it. When you are able to look in the mirror and know that you could be trusted in confidence and commitment in your relationship you clearly move towards the high ground. When you have faith that the other person in the relationship is working in good faith then you are creating a balanced and supportive relationship.
So what if you get burned because you acted with fidelity and had faith in the other person only to be disappointed? How you handle this will dictate whether you truly had trust and faith. If your guard was up in your relationship then that would be an indicator of the type of relationship that you were in and required reflection while you were working with trust and faith.
If the relationship did not rise to the level that you expected you know it based on how you value and incorporate trust and faith in your relationships. With billions of people on Earth, you can certainly count on getting burned but it should only help you to grwo in your relationships and not retreat from them.
What do you have to lose?