All I can say to you in relation to your post about "screwing up" is something said to me MANY times here, most forcefully by Oldtimer, is that you give yourself too much credit. ONE screwup will not end your marriage or your chances of saving it. MANY consistant screwups can and the fact that you know you did/said some things you regret is usually enough to get you to understand what NOT to do next time.
You said it yourself, there is 7 months of changes for her to look at and this one time where you just overflowed with emotion will not erase that any more than one isolated good deed will erase 7 months of bad ones. We ALL tend to over dramatize these things because we live under our own personal hellish microscope, examining every move and word for it's potential to help or hurt our sitch. Just know that single words and actions USUALLY don't have the power to do irrepaiarable harm to our sitches, no matter how much it seems like they do. Hell, our W's had affairs and we're still here, asking for more, so you can see how it may take more than a bad conversation to end things, even if she is looking for a reason to do just that.
Keep your chin up and just try to do better, whatever that is, next time.
