It's not that you don't trust each other, but simply one person has offered a silent or physical gesture that signaled a disburse of like energy to the other partner to sense his/her dishonesty. Which usually leads to or leaves a distrusting feeling within a relationship. It's not that the other person is simply paranoid, but yes someone has not communicated something clearly. Yet this can lead to energies of paranoia switching from one person to the other or just in the one person alone at times.
For women, grab hold of yourself in this case. Get out and away from your usual role for a moment and look from the outside to the inside of this situation. If you want to have success in your relationship you cannot always play your expected role and stay in the emotions you are expected to stay in. For example, jealous, controlling, and vulnerable when your partner sees you. If he sees you sad, he will think its just you and will not have a desire to converse with you being in that mode. Sometimes there needs to be a change in how you handle things and "yes" play a different role. Perhaps, instead of being a"wife", "mother", or "girlfriend" just be his friend and don't give a care in the world whether he is doing things right, wrong, up, down, or if he's giving you attention, at least for a week or two. Playing a different role will help you gain visibility from outside of "the box". Because when you see beyond your walls, it will be you that has begun to understand and move forward in a more "independent" role. However there is yet a desire from you to want him to move forward and heal as well within your relationship because it take two. You must cultivate patience and allow yourself to yield to the situation and your partner more than he. Yes, it is the one who understands and heals that yield greater to everything. Things that are true will show truth when the time comes.
In the guys prospective, they may be longing for intimacy, relaxation, and excitement that brings happiness into their hearts as they perceive it. Which in most couples, women tend to forget to cater to after a while. Men want the attention to be focused on them and usually are searching for it if they don't get it from their partner. A calming of energy for men is the key. Laying "low key" for a while and doing something you love will help you to root out this type of unnecessary desire. Why is it unnecessary? Because it brings unfocused thoughts into your mind and unwanted energies to mislead you into a "low" path that usually doesn't lift you in the areas of your life.
In summary, a good tip for women is to role play and change those roles from time to time to keep your relationship interesting depending on your situation, although be true to yourself as you keep your partner happy. If your partner realizes that you are in a particular role that just means he's paying attention. That should in turn bring some contentedness to you. A good tip for men would be to always keep at least three focus points apparent to himself. For example to strive for the passion of_____, learn more about family values, and finish school. The greater the positive thinking and the more focused there is on your goals list the more you will be able to use your natural potential to it's maximum ability and bring a sense of leadership for yourself and in your relationship. This is the direction a relationship should steer forward in. A win-win for the successful couple.
"Discouragement through unclear communication, mistrust, and mistake is not worthy of a failed relationship, once. But if twice, then it is the "bigger" lesson for both."