To be honest with this few details you dropped. Most people won't be able understand what you truly facing because they don't know what caused it or lead the loneliness at first but they can try and assist you they way they understand and they that could help you. Knowing the coursed and finding the solution actually meant for you.
On your post you said getting married, life become twice lonely. I don't that is true it's depends on the individual not the terms of getting married.
I know to have friends around is fun and awesome too, but first try your best to not be a stranger to you family before thinking of friends. Because true friends are the ones that stays with you no matter the damn situations. You got kid right? Why not make he or she your instead before thinking about those friends that left.
Create time for your families and love ones, and enjoy moment you spend with them eventually good friends gonna come around, just focus on your families and yourself first.