dennismm,
you might be dating too soon.
They may have walked from your grief.
I agree with you that giving and trusting isn't a fault.
I doesn't seem fair to yourself to see the three as walking away from you.
It's great that you ventured out.
Someone is going to be so lucky to find you.
I don't appreciate your DILs comment.
You might try to go off the medications, but be careful and withdraw gradually.
I don't find therapy helpful.
It might be good to have some activities where you are just around people. Take a class in photography or art, join a travel club, volunteer at a hospital.
Don't think about dating, now that you've sworn it off. Later it will be easier.
Bless your struggle. Keep posting.