Yes. My boyfriend is very much worth it. It's just that he's only human (and a male at that). Still, he's wonderful in so many other ways that I can forgive a little "cheating". Then again, I guess mine didn't really "cheat" in that he didn't try to lie to me about it or hide it from me. He told me right after he did it. (Heck, he called me from her place while she was there because he was so freaked out and so sorry about what he did.) Besides, sex just isn't that important to me, compared to everything else about him. We communicate very well and are a perfect match for each other.
However, I didn't touch him again (well, I hugged him, but no exchanging bodily fluids) until after I saw test results verifying that he hasn't picked up any diseases. He can claim all he wants that he used a condom (and I can believe him all I want), but it's a matter of respecting myself enough to take care of my personal safety, and a test isn't that big of a deal, so it's worth it to have him tested first.