Wow... Sorry 4luv, but I actually think you handled it all quite well considering. I actually would'nt file for anything.. that's what OW WANTS you to do. She clearly is TRYING to get you to let him go... so... don't... stay married so she really can see what a coward he is.
I dunno. If its just because you are angry about the whole thing I would reccomend not filing for separation or anything. If its MONEY issues and such then that's a different story.
Yes, you are better than this. Don't act out of emotion. Just hold off. I am NOT telling you to call H or contact him in ANY way. I have been saying for MONTHS to avoid all contact with him including any visitations he may pursue with his son.
But, you are right that your H was acting cowardly... infidelity is a cowardly action. Lying to avoid ownership is cowardly...he's afraid of the consequences so he lies to avoid them...
Anyhow.. I think OW was trying to pressure you into separating and divorcing... I think that's why she called. Don't do this because she got to you. Yes, your H showed some unsavoury character tonight, but don't act right away on this... really.. the OW will be as smug as can be if you did... and I don't think you want that. Just let it simmer and see if she actually does end things on her end... YOU don't have to take H back, but you can hold off. The longer you stay married to your H the more fights you seem to be causing over there.