I exposed her affair to her and my family and she was served today at work. She came home sobbing looking for me but I was still at work. Now at my parents house wondering what to do and barely answering her texts.
I think your goal is to move forward out of infidelity.
When you engage with her, it is OK to tell her you love her and want to stay married, BUT:
1. It is unacceptable to stay in a marriage with you and her AND her boyfriend. UNACCEPTABLE.
2. You will be willing to change to improve the marriage, but NOT if she is still in contact with her boyfriend. UNACCEPTABLE.
3. The divorce process is long and can stop or even dropped altogether, but she has been with you for 14 years and she has been with her boyfriend for 4 months, it is disrespectful to you for her to keep in contact with her while claiming she wants the marriage. It is UNACCEPTABLE.
Stay with this:
When you confront her, tell her that she has complete control of herself, and you don't want to control her. But you can control yourself, too, and you don't want to be in a 3-way relationship. It is unacceptable to you. You would be willing to re-commit to the marriage in good faith, if she did, but in no way if there is a third person in the marriage. UNACCEPTABLE. You will re-commit to the marriage if she drops the other man and gives you evidence that she has ended it, otherwise you are moving forward. You will not tell her what you plan to do, but it might include divorce, and you will do whatever you want to do when you are ready to do it. You make no promise that you will be willing to work on the marriage in the future. Your feelings are changing up and down every day, and you might decide you don't want to bother if she pushes you further.
Tell her you don't care if she calls it an "affair" or a "friendship" or a "flirtation" or whatever the hell she wants to call it, it is UNACCEPTABLE.
Do not give any ultimatums, let her know you are moving on, then distance yourself from her, detach, be polite, but do not talk with her of your relationship, the future, nothing but mundane chores, finances, or small talk, nice weather, isn't it. Be as happy as you can. If you can't detach, if you can't stay with her unless you are angry or sad, then stay out of the house more, come in late, go to bed, then go to work. If she wants to talk with you about the relationship, ask her if she did what you asked - drop him and give you evidence. If no, then tell her, "I have nothing to say. I refuse to be in a marriage with three people."
Maintain the mantra you used the other night. Tell her she needs to break up with her boyfriend. When she says she has had no contact with him, roll your eyes. If she pushes you on it, tell her you need to see the evidence that she has broken up with him. Do not go to marriage counseling if she has not broken it off with him. Tell her there is no marriage to save if she still has a boyfriend. Ask her what she would do if you had a serious girlfriend who you wouldn't break up with.
Use those types of phrases as a mantra when you have to engage.