Mpd, I'm hearing what you are saying a little differently than some of the others. When I first was faced with the realization of the affair, I was floored. I had become a SAHM, and would need continuing education in order to reenter my profession. I felt terrified of the enormity of divorcing this person who up until the day before, despite all of our issues, I planned to grow old with. All of this, let me make some bad choices. I took blame where I shouldn't have, I tried to take over the healing for both of us so that I could feel like I had some bit of control, and the worst is I let WH get off with only partially coming to the table. The result is that I was in false R for four months, and it was devastating. Just as much as Dday.
I say this to you, because I see some warning flags in your post.
1. You are taking blame for your wife's affair. Your wife saying that she was pissed that you took too long to propose and that is why she cheated is blame shifting. If she isn't saying it, and you are just blaming yourself, stop. It is going to get you no where.
2. I hear a lot of fear of the unknown and change. Watch out for that. Don't let it control the choices you make. If you react out of fear of failing to R, it will keep you from getting healthy.
My advice is to get into IC immediately. Start taking care of yourself. As a condition of even considering R, insist that your wife get on meds and start counseling too. Then watch her closely. If she is remorseful and her actions show it, you will start feeling ready to look at MC and reconciliation.
My marriage was not in a good place prior to the A. With the work we are doing, we are both MUCH better people and our marriage is better for it, however long it lasts. The best feeling for me right now is that I know I am CHOOSING my marriage. I am working on it because I feel it is becoming something special. Not because I figure any man will lie to me, so why not stay with the father of my kids? Or because I am straight up terrified of being a single mother. Before now, these were major motivating factors for me. At 7 months out, this shift is just starting.