Tumbling, how many things have happened! I'd been so busy with the whole missing passport/SS card thing.
Anyway, what I have to say is that you should not press for any commitment until you are both ready. He isn't. If you put pressure on him, all this progress (I know, it's small, but it's still progress) will be wasted.
I'm also an only child, and my dad passed away when I was only 8. I spent all my time after school alone. So, I have a hard time living with anyone. I like to have my "me" time and to keep my stuff organized the way I like it, etc. But I realized that all that stuff doesn't really matter as much as having real love in my life. It took me a while to realize this, and I admit I did take my H for granted in the past. I thought he'd be there forever, for better or for worse.
Think about what you want and all, but remember that your emotions will change often, and sometimes your emotions will guide what you think you want. I get a sense you are in love with your H, you miss him, but you're afraid that if he comes back to the M, you'll be unhappy. Ask yourself why. Ask yourself what would need to happen for you to be happy, and keep this info in a safe place for when it's time for you and your H to have that talk.
I don't think you should be texting him or asking him why he didn't reply. But it's your call. I'm sure that if you pull away a little, he'll start initiating contact. You'll see.