Flower, please don't do it. I had a similar situation (my ex came back after 23 years) and I let him back into my life. I thought this time is different, we will be together forever.
After he got what he wanted he wasn't interested any more.
As a pp said, if a man loves you, he will never, ever let you go.
And the saddest thing is, I used to have wonderful memories of the past. After the way he treated me recently, they are now tainted, gone.
You have idealised him, he is not perfect, he is not the one who got away. If he was meant to be your life partner he would have been.
If I were you, I wouldn't follow this advice. But once the inevitable fallout happens (and it is worse for you as I am not married), you will simply think "how could I have been so stupid?"
So please be strong and tell him not to contact you ever again.