Any hope for change?

Only just found this forum, but signed up in desperate search of an outlet with people who understand. Last fall, my wife of 6 years cheated on me. It was a brief occurrence... probably only a couple weeks from first meeting to sexual meetup (and only a few days after that before I figured it out). I was absolutely shattered. We are stark personality opposites and have always had our little rough days, but in the end we could at least always trust each other or so I thought. Turns out our mismatch of sexual interests (i'm pretty... 'boring', you might say, while her interests are anything but) was more severe than I thought. After months of crippling depression and a painful degree of tension in the house, with counseling and time I came to have hope for reconciliation... and even to forgive her for what she'd done. By the holidays we seemed to be doing enough better that I even agreed to cancel the remainder of the MC. Fast forward to March.... she is now almost 3 months pregnant... and I have learned in the past couple of days that she has begun cheating again - slightly before and now during the pregnancy. So far, this consists of an online long distance sexual relationship... and an R-rated lunch date w/benefits (with a different individual than the online relationship). The lunch date would likely have been X rather than R, I think, given a more private setting and less pregnancy nausea. I have not yet confronted her about the lunch date, but since learning of it I've been overwhelmingly depressed, and my trust for her feels completely destroyed. Should I have any hope that she can change? I love this woman, but I cannot live with someone who will continually break my heart like this.

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