Please don't beat yourself up over this--it was a brief impulsive act and your not going to answer his calls or call him again.

It's not your fault that he called. He knows your married and with your past together the most caring thing he could do for you is to stay away. It was selfish of him to call but hopefully it was just a brief impulsive act for him too.....

Your H is so much more important than this guy so I hope he never has to know or get involved in any further drama but he knows you are impulsive. This will work itself out since you have gotten your priorities straightened out....