Greetings @amimettalove, nice to see you again.
All we can do is put in the causes, the outcomes are out of our control.
Furthermore, it is hard to be sure about the outcomes and their ultimate effect. For example. some things that happen to us may seem to be exactly the opposite of what we want, or imagine what we want, at the time, but then turn out to be exactly right, or the opposite.. or any combination.
So the thing is, to be open to positive outcomes of not getting what we thought was so important to us. For example, if if comes to pass that the man you are teaching has lovely qualities, but they are not matched to this specific thing, then maybe it could be of use for him to focus on other types of things/jobs/activities that are a better match for him.
He has obviously made a deep impression on you, so it is likely there are good qualities that can be of use in other circumstances and places.
As a trainer, it is natural to highlight the good qualities and talk about where they would be most matched and useful, so it is a win:win for all parties. This is a kindness in my view - an adaptive and compassionate lens through which to look at the realities of employment or volunteering.
Though at the end of the day, we can only do what is possible, and if you know you have done your best, with compassion and care, then, no matter the outcome, there is nothing to regret, but leads to an appreciation of the Dukkha in the nature of our world. His experience of the caring way you interact with him will be a positive thing, and that will be of benefit, no matter what.
I hope these few words may give you a few ideas for how to progress.
Much Metta
