1) I don't see how one can conduct an effective discussion about gut-wrenching matters by text. Remember: we communicate with body language and tone of voice more than by words. Body language and TOV play parts in in composing a text (or email or letter, etc.), but none of that is communicated by the words that show up on a screen.
IOW, you are almost guaranteed to mis-communicate in a conversation conducted by written word. Your W probably misread you, and you probably misread your W.
2) R is M. In M, a couple usually spends a lot of time face to face resolving issues, sharing thoughts and feelings, and doing things. That means, IMO, that during the R process, you communicate face to face as much as possible.
My reco: next time a conversation starts by text, stop it early and suggest waiting until you can carry on the conversation face to face.
3) I know of nothing that says you need to forgive your WS. I'm all for forgiving when it's in the BS's interest to forgive, however - but that doesn't seem to be what your W and her cousin are demanding.
3) R is possible without forgiveness. I suspect most BSes who R do forgive, but it's not necessary.
4) Forgiveness is easier for the BS to give if the WS earns it, and it's easier for a WS to earn it by being remorseful, taking responsibility for the A, and changing from cheater to good partner. Demanding forgiveness is no way to earn it.
*****
I'm sorry this cousin spilled stuff she should have kept private, and I'm sorry your W opened up to her cousin instead of to you.
fBH (me) - on d-day: 66, Married 43, together 45, same sex apDDay - 12/22/2010Recover'd and R'edYou don't have to like your boundaries. You just have to set and enforce them.