Faith in Jesus Christ is strengthens gradually and only not through dramatically, isolated experience. To keep faith strong, it must be constantly nurtured and nourished just as the body and mind must be constantly rested and nourished.
"Learn of me, and listen to my words; walk in the meekness of my Spirit, and you shall have peace in me." Doctrine and Covenants 19:23
"And as all have not faith, seek ye diligently and teach one another words of wisdom; yea, seek ye out of the best books words of wisdom; seek learning, even by study and also by faith." Doctrine and Covenants 88:118
"But behold, if ye will awake and arouse your faculties, even to an experiment upon my words, and exercise a particle of faith, yea, even if ye can no more than desire to believe, let this desire work in you, even until ye believe in a manner that ye can give place for a portion of my words." Alma 32:37
Daily trials such as death, illness, discouragement, weaknesses, misunderstandings, and simple can be overcome and used to our advantage with faith in Christ. This faith can also strengthen our relationships. How? If we love Jesus, we strive to keep His commandments. One of His commandments is to love our neighbor. Paul defines the pure love of Christ as Charity. People who strive to act with charity without fail show kindness, meekness, and patience, behave decently (meaning they don't throw temper tantrums but do consider the feelings of others), are not selfish, are slow to anger, don't jump to conclusions, give others the benefit of a doubt, aren't glad when ANYBODY suffers, seek the truth, minimize their troubles, and try to solve problems creatively. In other words, charitable people love others in a gentle, kind, godly manner.
"What doth it profit, my brethren, though a man say he hath faith, and have not works? can faith save him? If a brother or sister be naked, and destitute of daily food, And one of you say unto them, Depart in peace, be ye warmed and filled; notwithstanding ye give them not those things which are needful to the body; what doth it profit? Even so faith, if it hath not works, is dead, being alone." James 2:14-17