B,

I'm not really sure what to say to you anymore.

Saying in that in front of your son is just a so wrong. Arguing with her out in public is so wrong.

Continuing saying the same thing over and over "I will not be in a marriage with a 3rd party " but yet again you are and that doesn't seem to be changing anytime soon.

Then in the end again you with the "please pick me" statements.

I think you two need not worry about counseling for yourselfs but you definitely need to get your son into it. The way you two act you want to try to minimize the damage as much as possible.