OP, are you rather impetuous, the way you write, as a kind of continuous stream of consciousness, and rushing into moving in with a new man, suggests you may be.
perhaps that is why your mother is concerned about your decision-making; maybe she is worried for you, doesn't want you to fall into another regrettable relationship.
you say you want your own home again, but it won't be your home, you will be staying in his home, so that puts you at a disadvantage.
why don't you consider doing some live-in work, it pays well, somewhere to stay pro tem, and would give you time to carefully consider your next move.
don't jump feet first. stand back. take your time.
don't make yourself vulnerable. good luck.