When is it time to end therapy?

Hi guys. This is a continuation of the thread I started around December: I hope I'm not a fool Most of you are familiar with the story (those that are, are welcome to skip to the next paragraph), here's a quick background for those who don't: my boyfriend of 4 years had an issue with sexual chats on the internet which I today consider a form of cheating. He told me about it soon into the relationship and being young and not really knowing how I felt about it, buried my head in the sand and said it was ok (like porn) so long as it was random different people and not a continuing chat relationship with one person. A year and a half or so ago I realized how much it bothered me and asked him to stop. He agreed, there was some miscommunication and it was severely reduced but not ended. Some back and forth, it nearly ended our relationship, he got a lot better and I thought it had ended. Then comes December - his first relapse in 6 months. I decided to break up with him but he was adamant and sincere about saving our relationship so I agreed to give it one last shot if we go to therapy. This brings us to today. We have been going for 4 months now. Honestly, I'm not sure what it has given us except perhaps a better understanding on his part about why he did it and understanding how serious this is to me. I don't feel that the therapist has really "solved" any issue or given us specific instructions, tools or modes to measure our "success". Something to use or hold on to, to handle the situation or give me confidence that it won't happen and what to do to prevent it from happening. We're kind of going in circles at this point and it feels as though it just comes back, again, to trust. My bf knows now how much of a threat to our relationship it is, therefore he won't do it. Before he thought I would be okay with it so long as it was muted and infrequent. I don't like where we are, I was hoping for something I could really hold on to. Something practical. Tools, "homework", methods, blocks for me to rebuild the trust but that hasn't really happened. I don't know if the therapist just isn't that good or if those aren't things that can be found. My bf and I had thought that it might be an addiction but that has been pretty much disproven. At this point he says he doesn't even feel the urge to go on the sites. Anyone have any advice how to know when to end therapy? When it has run its course? Even a helpful link to some website would be fine. I really down't want to pull the plug when it's too early but I'm starting to think we simply will not reach a catharsis. And I'm sick of going in circles.

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