I think everyone is giving you the right advice to focus on you, your kids, and keep moving forward. Please think about this long and hard. I have thought about it. What do you want? What would you do if some miraculous change occured, h showed up at your door, and begged to come back.
Really, what would you do? I'm not trying to sound harsh or mean, so please don't take it this way... What if something happened to him and his gf? What would the end result be? Do you want to be his "leftovers" ? Do you want to be his person waiting in the wings? The scraps when nothing else is left? I'm not saying hate him or anything like that. You shared lots of years. I'm just saying put ALL of your focus forward and not glancing behind you to see if he's ever going to follow.
My h wanted both of us, and I cut him off (physically, and I will talk to him, but not get all involved emotionally). i don't want to be the scraps. I am the premium cut LMAO. Sun, what are you??
"Success is the sum of small efforts, repeated day in and day out." Robert Collier
"One's best success often comes after their greatest disappointments." Henry Ward Beecher