Welcome to the board. You'll find a wealth of knowledge and compassion here.
To try and answer your question to What now? You don't have to decide anything right now. First things first, as hard as it can be, try to focus on yourself and adjust to your new reality. Infidelity is enough to bring anyone to their knees. It doesn't mean weak, it means that you're human, it means that you've been betrayed.
How is she reacting to all of this? Does she seem to be remorseful? She said you're boring? What did she expect you to do to now be boring?
I'm sorry you're going through this. It's a long road to healing especially if she's not helping.
There is a lot of good information in the Healing Library in the upper left corner of the screen in the yellow box.
Vent all you want, we're here to listen.
Keep posting, it helps.