Something similar happens to me, I don't trust again someone who has let me down or hurt me, but it is also true that people can change if they make the effort to do so.

I have taken risks, sometimes too big, I have gone wrong, but on those occasions I have learned and improved. On other occasions the rewards were slow in coming, but they did, and for that it was worth it. Most of the time the risks have brought me good things and that is rewarding.