It is a MENTAL battle. You can ignore what he does or obssess about it. I would try to acknowledge the pain and let it go. Do not let your thoughts and "I wonders" fester in your mind and take up prime real estate there. You have to get mentally tough while not allowing your heart to grow bitter.
Don't get caught up in the daily drama of what he is doing. Don't let it play in your head like a 24 hour news loop. Get caught up in Aver.