Hi there. I'm sorry you are hurting. Mom to mom-- and as a mom that has thrown herself into raising my own two boys, I can only imagine how hurt I'll be when they leave me and go on about their life seemingly forgetting all I've done for them or how much I care for/love them and all the fun we've had during their childhood. But . . . I know it is inevitable. This is what happens.
I agree with rockrose. This is a new phase in your relationship with your kids. They aren't your confidantes and they aren't responsible for fixing your problems. I'm so sorry about that. I wish they'd just want to do that . . . but if they don't, they really aren't supposed to do that at this point in their lives.
I think this is YOU time in life. Discover who you are outside of a mother. Good ideas by rockrose to explore how you can make connections. Friends is a good thing to do. Churches if you are religious are a great place to develop a sense of belonging to a community. Find things for YOU that are not involving motherhood or your sons. Build a life.
I'm sure your boys love you. But they are busy living their own lives as you once did yours. It's part of the process of life. hang in there and hugs
Here's the way I see it: your job was to raise your sons the very best you could, give them everything you thought was best and put your soul into it. THEN, they grow up and repay that treatment by raising their own children the very best they can.
I think you should be as pleasant as you can be on Sunday evenings, don't make the conversation focus on you and your problems, focus on having a nice time together.
And I also think you are in desperate need of friends. Can you join a book club, or do you play bridge, or have any similar interest?