There's a lot in this chapter that is very insightful and indeed helpful. You probably haven't gotten this far just yet (not only in the book, but perhaps in your R as well), however, I wanted to share this bit (I've had to reread it myself several times):
If you feel comfortable right now that your partner is not violating your trust, don't sacrifice the pleasure of today because of what might happen tomorrow. If you had a serious illness that was successfully treated, you'd be told the probability of recurrence. If you were fully recovered, you wouldn't want to waste your healthy days preoccupied with the possibility of a relapse in one year, five years, fifteen years, or maybe never. As long as you're doing everything in your power to have a thriving R, you have to transform your suffering into appreciation for how far you've come. Worrying won't change tomorrow. It just takes the enjoyment out of today.
Getting over a painful experience is much like crossing monkey bars. You have to let go at some point in order to move forward. ~ Joseph Campbell