There are a handful of old timers that have a running "joke" around them because they bring in a younger girl for the act about every ten years a.k.a. the dirty old man condition. While I think it loathsome it has been as much a common side to magic as the Top Hat & Tails. Similarly, there are those acts that are so dependent on a good partner that is loyal, honest and dedicated and yet, things get screwy and there goes "the act" -- one of the best examples is when a husband & wife or partners start working on a code act; nothing has brought about more destroyed relationships in this biz, when it comes to the art itself. Such acts are challenging and trying but once you get through the rough spots, you have a winning thing . . . until one of you get wondering eye syndrome or caught-up in an addiction of some sort, etc.
Relationships are hard enough, but when we try to have one in which our spouse is involved, the stress can become horrid. Just having an understanding and supportive spouse is hard enough to find, let alone one willing to be part of the act; a situation that now day's requires something akin to a Prenup agreement just to cover yourself and the secrets around the act. A scenario that's insulting on one level, because it challenges/questions trust & loyalty -- not exactly a good thing when it comes to situations involving amoure.
ON THE MORE PERSONAL POINTS. . . you have a 10 ton elephant in front of you that you're ignoring. This individual IS NOT being supportive but more a major detriment. There comes a point where you have to start looking at your own life, your own goals in life and discarding the things that are conducive when it comes to reaching those goals. The sad fact being that this "boy friend" needs to get off his backside and become a productive human being or else you need to change the locks on your doors and set his stuff out on the lawn.
If there is absolutely no positive factor coming from this person and he is making his burdens your problem, you need to boot him out of the door and out of your life. You need to do this in a very concise manner, with witnesses and if need be, legal counsel.
Yes, it's hard to do this because we tend to want to think of the "better side" of such a person and we will remember the good vs. the negative. But what is more important is the question that must be asked; enabling this person for the rest of their life for the sake of good (?) sex and on-going grief . . . the loss of your own dreams? Or, is it more important to claim back your life and work in a positive direction that will bring your dreams to life?