You can’t let yourself lose sight or faith in others though because it is such a difficult quality to build up. A dream about disbelief is just the first sign that this is the road you are headed down, don’t let this happen to you.
If you have a dream in which you are in disbelief of something then this means that you have been astounded by some new information in the real world that has left you speechless. You are reeling from all the new information that you just learned and are worried about what it means about you and what this new information will do to you. If you have a dream in which someone else is in disbelief of you it means that you feel dishonest, you have probably told a few lies lately.
Essentially, while having trust is not necessary to living a full and happy life, having trust and not always experiencing disbelief in others is something that you really need to do. Yes you will probably be screwed over by your unquestioning trust at some point in your life and yes you are probably going to have to deal with a lot of flack because of your unrelenting trust and faith that you have in others, but you also need to realize that it is better to trust than to not trust because it allows yourself to be more open to others, which is essential in establishing meaningful close connections with other human beings, which is essential to the human experience.