Funny enough... I have real life experience from the coming out side.
I was in the similar boat of remaining closeted for the sake of living at home. However, one day, I felt compelled to come out to my mother. I didn't exactly think the entire thing through and I did it out of compulsion and vindication.
I lost all the benefits of living in my mothers home. I was thrown out with very little to survive. Its not important what I went through apart from the fact that I was forced to quit school in order to work. However, regardless of how difficult my life may have been, I don't regret what happened. I'm now comfortable, living in a place where I can go to sleep happy every night. I have a degree and I'm back in school and doing very well with my life. I'm not necessarily saying what happened to me is good for everyone. If I could do it again, I can promise I wouldn't have changed anything. I don't regret what happened. I learned a lot from the real life experiences and I learned to appreciate how hard life really is rather then expect to live a comfortable life receiving financial support from family. And to me, honesty is one of the best values we can have.
I'm not a particularly strong person. I don't find myself better then anyone else because of what happened to me. I don't disrespect those that remain closeted. I see them as doing what they have to in order to get where they want to be. I'm just grateful at the experiences and troubles I was faced with and I'm appreciative that my life happened the way in did. However, as I see it, It really comes down to what Billy thinks would be the best thing for him.