Scanning personal history for evidence of abandonment, abuse, and other components known to cause problems with emotional management, it seems I have problems in trusting people close to me. While my childhood was free from the most savage forms of direct assault, it wasn't apple-pie, either. There are reasons in there for my processing and responding as I do. We all have these reasons, and we all have relationships with people inviting questions of trust with variable answers.
Sincerity, also, seems centred in Self, where there's no-one else to judge it unless they choose to, and only then from their own viewpoint through the prism of self-reflection. Even the most die-hard liar has to think deeply with sincerity, no matter what they are doing. Forgiveness, too, is a product of honesty; you can't genuinely forgive unless you find it in your heart. An important commodity, is forgiveness, proven to earn a gaining of ground in so many respects. So it comes back to trust, back to the Singularity, wherein that leap of faith might not hurt so much after all.