Most Helpful Guy
read this: www.girlsaskguys.com/.../a35497-exes-they-are-ancient-history-why-even-care-or-bother
Don't concern yourself with that issue at all.. he moved on.. you need to also.
Most Helpful Girl
Why do you need to say anything? You're not really friends, you're just amicable ex's.
His girlfriend, crazy or not, is his problem and I think you should just leave him to it