It isn't easy at all to come to a decision to end your marriage. Sometimes it takes a D for the MLCer to realize what good they've had with their spouses and family. Let him go and spackle some more kitchen walls! I guarantee you that he and RT won't last beyond 3 months.
I want to add to what Job said above. Don't help H find his new apartment. Let him do the heavy lifting. He needs to find out what the "real" world is like out there without his wife swooping in to help him out. Welcome to life's hard knocks as a 'single' man in his mid-60s. Oh and be sure to step aside when it comes to H's relationship with your sons. It is his to figure out all by his lonesome self.
2014 is a year where you can focus on yourself, your grandbabies, and make more knitted scarfs from your weekly club. Make it count! Really.
As you enter the new phase of your journey as just "Linda", not "H's wife", please be sure to come here for support as I imagine that there'll be some speed bumps along the way as you two head for divorce.
You've got this, baby!! You look and sound stronger now than 6 months ago. Wow...clappy, clappy!!