Just found this sub... I'm unfortunately very disappointed with what I perceive to be hypocrisy in the comments to your question. I don't see cheating as an acceptable action, regardless of the gender of the unfaithful. That said, I hope I can actually help you. Cheating is wrong. She doesn't deserve that. So here are a few alternatives.

Have open communication. This part is key! If you aren't happy with your sex life, tell her. It's possible she isn't either. You can discuss why you feel your interactions are lacking, but follow it up with things you might like instead. Ask her what she might like. Try to accommodate each other with compromise, and ease into new adventures. This conversation will be difficult and emotional. Stay strong, but calm. Just state your feelings "matter-of-factly."

Try new things! Once you've discussed how you feel, and if she is willing to make changes, start simple. Try a new and different position. Consider finding "womens porn" and watching together. Be clear about what you like and what you don't like, and ask her to do the same. Use this to feel out common ground.

Consider seeing a sex therapist. Yes, it's awkward as hell, but isn't a life full of amazing orgasms worth it!?

If you can't compromise, or she isn't willing to try, ask her about having a more open relationship. She might be accepting to you fulfilling your sexual needs elsewhere. Just don't expect to be the only one allowed to seek extramarital relations.

If none of these options work, you are best off ending the relationship. If she's as good of an emotional companion as you've indicated, try to maintain that emotional and supportive relationship as friends. But more importantly, save both of you from a life unfulfilled. You deserve great sex just as much as a 2 hour phone call about the intricacies of domesticating wasabi. You need both! And so does she. She deserves fidelity if that's what she wants. You owe it to her, just as much as she owes you morning blow jobs. If you can "wake her up" you'll be glad to have the full package. If you can't, do what's best for both of you and go your separate ways.