Me too. Todd and Sean were always a mismatch. It seems no matter what Billy did it was never good enough for high maintenance Sean. Billy's job means everything to him, but Sean never understood that, he always had to come first. If the job did get in the way sometimes he complained and moaned about it for days. Todd on the other hand didn't complain at all, instead he showed up at his work to help, twice! Both with the bishop and the plaything. They just seem to be a much better match, they "get" each other. They are both flawed, but they never try to fix each other, they accept each other and love each other with flaws and all. That's the very definition of a healthy relationship. Sean wanted Billy to change for him, and that's why it could never work out between them.