Pas, I don't know that I fully understand your 3 types of affairs. I'm not much into categorizing anyway. But since you ask, I'll take a stab at it. Bridge affairs, by your definition, are sure to end the marriage. However, I'm fairly certain that everyone on this board whose spouse is having an affair, and that's a lot of people, would define the affair as a bridge affair. Yet there certaintly have been those who have overcome the infidelity and gotten their marriages back on track.
So, I don't know how to respond to your question. Some people who think they're madly in love with their affairees, come to realize that things aren't quite what they seemed.
But this doesn't mean a thing to you if you're feeling hopeless. I know that. I just don't think that affairs or people fit into nice little boxes. Life would be so much more comfortable if they did. I wish things were different for you. Michele