What should you do? You should stop buying into all his horsesh@t! He lost love for you and found it for CW because there were dishes in the sink? The rug could use a vacuuming? (They never actually need it, you know.) Horsefeathers!! He's just blaming you and you take it all to heart.
Repeat after me: H takes no responsibility for his actions in life. H takes no responsibility for his actions in live.....keep going. Do it until you can say it in your sleep. Because that is the truth about your relationship with H.
Yes, you are in pain. Yes, it is a death and you have to grieve. This cannot be swept under the rug or vacuumed away as H would like. This really is a mess. This is his mess that he left in your house for you to clean up. And it is NOT your fault. He stole kisses with her. He found time to be alone. He dropped his drawers and saw stars. NOT YOUR FAULT!!!!!