After reading the rest of this thread, and going back and re-reading the original post and my response, I'm going to offer my apologies for suggesting that you got too far away from your buddy. I misunderstood -- I got the impression that he didn't want to continue the dive, and you kept on, going deeper, even though he didn't want to. Now that I read your response I see that I was wrong about that. If you were only 7 feet away from him for a few moments, as you explained here, then that's not abandoning your buddy. Again, my apologies for misreading that.
One thing I should have said in my earlier post is that one of the "red flags" that I mentioned about your relationship that led me to suggest that it might be doomed is the fact that he's blaming you for him getting bent. Out of your whole story, that struck me the most (other than the fact that he said he never worked on dive tables in his OW class!). You didn't make him do this dive, you're a newer diver than he is, why on earth would it be YOUR fault? That just bugged me. We're each responsible for ourselves. And besides, like most in here have said, I doubt he was bent anyway. But even if he was, why blame you? That's just bad relationship skills!
(I do want to say that I don't appreciate being referred to as a lou lou because I expressed my opinion. Isn't that what we're supposed to be doing in here -- discussing these things? She posted and asked for opinions. I'm not an expert, but I'm trying to suck up all the info I can, and one of the key things that is being force-fed to me on every dive is the buddy team concept, so that's what I talked about, based on my understanding of her post.)
I still think that doing a 100 ft dive for your first post-cert dives is extreme, and I would fault the DM for bringing you on that dive. Even though I know lots of people ignore the rule, the fact is that OW only certifies you to dive to 60. I didn't do a dive past 60 until my AOW class. I'm just not comfortable with pushing the limits and ignoring rules of thumb in such a dangerous sport.
As for the suggestion that scuba diving is NOT as dangerous as I said (i.e. only one breath away from dying) I respectfully disagree...especially at 85+ feet. If you're at 40 feet and you go OOA and cork, you'll more than likely be fine. But 85? I think that it's just not wise to minimize the risks inherent in diving. I personally don't intend to end my life underwater, and having a health respect for the risks involved in this sport is, I hope, what's going to keep me alive.
I'm glad that you had a great rest of your trip and have taken to diving so well. Diving is not for everyone. Sounds like it's not for your BF.