You have been through the mill that's for sure. I have been widdowed for seventeen years, at first it was very hard and my youngest was just four years old. So I understand about the 'talks' as I had to give them to my three sons. Not comfortable conversations but necessary ones.
As to relationships, I have had offers since becoming wheelchair bound which floored me because they were from able bodied men. So there is hope. The thing I learned was that no one is going to come knocking at your door, you have to put yourself 'out there' a bit and, yes, it is a risk, but companionship is a human need the same way that food and air is a need.
It was my own choice to remain single but I will admit to enjoying the company of men, they're such funny creatures! Life changes sometimes so unexpectantly so instead of waiting for it to change why not get up and change it? What have you got to lose? Best wishes.