Jellybeans

Stop skyping M. You are asking for a sh!tstorm. Stop being selfish and cut it out.

You know better. How would you feel if your husband were scheming behind your back professing feelings to a married woman with children? How do you think M's wife would feel?

Having an affair complicates everything...and doesn't resolve the key problem...your issues within your marriage.

End it and focus on either rebuilding your marriage or terminating it. But don't take another marriage/family down in the process.