Georgiegirl, you are far from being alone, as my OH and I come into the same category.
Like you, we take an interest in people, and those in need, we help if we are able to, but unfortuantely this is not reciprocated.
This was never more true than when a couple of years ago, OH became very ill and unable to work, (we are both self-employed and running our own business together, OH is the hands on, while I do the paperwork) Are you picking up the scenario? No hands on means no paperwork.
At one time OH's son used to work for and with us,but decided after a lot of expensive training, it wasn't for him,so he left. We did think however, that in this instance he would offer to lend a hand,but "No" not a chance.We didn't see him for dust. Consequently, we were very much on our own, nor, did he visit or did any other relatives.
Recently, S's marriage fell apart, and who did he come to first?? that's right his Dad, and between us we offered to help him out financially to put a deposit on a flat that he wanted to rent. Since then he has been conspicuious by his abscence, except to bawl down the phone at both of us because he didn't agree with his Nanny going into care. Truth be told, he could see his 'inheritance' being swallowed up in Care Home Fees.
OH and me between us have 8 close blood relatives,of adult age, 4 of whom have never visited us,despite living only 17 miles away. 2 only visit when they want money, and the other 2 do visit on a social scale as and when they can, only to kick us in the teeth a short while later by boasting of this that and the other.
OH and me have now decided that we are better off on our own. Life is less hassle.
So, chin up georgiegirl, you are not alone, and for a start you have us all here, who although may not see you, are more than willing to be friendly and supportive.
Best Wishes to you and your OH.