Dear susieque:
As I read your post I paid attention to the fact that you are making certain assumptions that may or may not be true. You assume that
1) The reason most of the friends your hasband and you had drifted away from you after your loss of your hesband is that you are now a single person and no longer part of a couple.
2) The young man who helped you in return for you paying his bills should be grateful to you; that you have given him in the exchange more than he gave you.
3) The young man was a coward in the way he ended your relationship.
4) The young man’s girlfriend was jealous of your more-than-friends, more than mother-son relationship with him.
5) “These people” threw your hospitality back in your face, that is they were ungrateful and rude to you.
6) Your son should have rejected his friend and is further hurting you by excluding you.
7) “All these ungrateful children” have betrayed you.
8) The young man was an opportunist, taking advantage of you because you have some money.
9) People are not trustworthy and you have no choice but to “live alone with no trust.”

You didn’t ask any question in your post. My suggestion is that you review the assumptions I listed above for accuracy. Since your conclusion is to “live alone with no trust” is based on some or all of these assumptions, better question them, look for evidence for or against, get feedback from some people. I will follow your post to see if you respond and I will in turn further respond.
anita