Like you said, you have a lot of insecurities. It takes time. About the bedroom, I'd suggest you wait until the next time she complains about the sleeping arrangements and then say, "You are welcome to come back to the master bedroom", and leave it at that. That would not be as much pressure as if you brought the subject up to her. If you do invite her, don't get all dramatic about it but have a "whatever" attitude. You probably don't understand why I say that, but if you show your intense feelings then she is going to run for the hills. You already feel insecure, so I would be too quick to add to the load. If she really is sincere, then that's her clue to move back. If she doesn't, then I think that is a red flag. It's not that anything is set in stone about having make-up sex or anything, but she could sleep in the same bed. However,if she complains and then declines.....somethings not right.

Keep all your self-improvements going. The biggest problem with those who return here is the fact they fell back into their old habits. I would taper off staying out late at night and devote time with the family.....HOWEVER, do not start smothering her. And if she starts acting cold...that's when you step it up GAL major time.
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It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!