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Here is a suggestion that I hope might work. Yes, by all means have your boyfriend move out. (Do not worry about the cats. You can always get joint custody for the time being. In terms of furniture, if you cannot decide then sell it and split the money.) But,you do want to save the relationship, right? So, here is the suggestion. First, you ask you boyfriend to read this suggestion. Second, you two break up. Then your boyfriend has some fun (threesome sex or more-let him try things out). Now that he has tried what you have tried and obviously it has no meaning in your new relationship, you two can get together and talk about it. You already know that your past sex life does not matter and I am sure that you will understand his past sex life and you will be more than able to forgive him. After all, his threesome happened before your second relationship. And, if he is still a stick in the mud, then he is not worth it. Good luck!