But how does one learn to trust God with all their heart, especially when someone they trusted has broken their heart?
In my own journey toward intimacy with the Heavenly father, my first step in learning trust Him was to clarify our job descriptions: My job is to be faithful, God’s job is to provide results. I have found that whenever I feel anxious, fearful, or overwhelmed, it is a result of my trying to do His job. I must be faithful in trusting Him--even when I don't understand Him, even when His timetable is different than mine, even when I'm not sure I want to be on the path He's charted for me. Trust involves aligning my will with His, not the other way around.
Trust is fully relying on God to do what we can't. Perhaps that's why we are encouraged to trust Him with all (y)our heart. Half-hearted trust isn't trust at all. When we don't trust with all our heart we leave room for doubt and fear.
We may have people in our lives who have proven themselves untrustworthy. But we have a Heavenly Father who can be trusted wholeheartedly. He is a Father who has never broken a promise. He is a Father who can do what we can't. He is a Father who genuinely wants what is best for His kids.