Funny thing Lam, this had dropped off my 'I'm on' threads and so I went looking for you - you've been on my mind
and here you are - glad you posted again.
Is it terrible to say I'm really, really pleased to hear your update? Maybe that's because to someone on here, who only knows you from the wise, thoughtful posts you've made on this situation, can see that you're very far from the same scared lonely person you clearly, CLEARLY were when your H clearly, CLEARLY homed in on someone he could (at that time) easily manipulate.
Things will NOT be the same - life has moved on a tremendous amount for you. Your DD isn't a tiny baby you've suddenly got to learn how to care for - she's a lovely thriving four year old and you're a confident parent who doesn't need to spend all their time double checking and stressing about every little thing. You have more confidence in your parenting, more time to see the wood for the trees. Totally different.
You also have your job and a way forward, and are financially on an ok path. Another huge weight lifted and great for confidence.
I'm also betting that you have also grown massively as a person and learned huge amounts about what really makes us happy and what REALLY matters in life over the last two years - a great deal of it because you've been in this very odd, looks-ok-but-under-the-surface-it-really-isn't relationship and family situation. Such a valuable lesson that some people really never learn. Will you be lonely after leavign him? Yes, sometimes - probably a lot of the time at first. Will you be miserably lonely? No. You'll find yourself sitting with your family on a Sunday afternoon and suddenly remembering the feeling you had in your stomach seeing your DD be pawed at by his family and you'll feel a rush of relief and security and happiness which will more than make up for any lonely pangs. You'll really REALLY value the honest undemanding proper love of your family and your real friends and you'll know first-hand just how much it's not worth settling and just how creepy and fake his love-bombing when he hardly knew you, was. You'll have a deep peace that you've done the right thing for your DD that will make any lonely or lost feelings pale into insignificance.
Most of all, you will be equipped with experience which will stand you in such good stead in the future when you date again. You're young, you'll almost certainly have a new partner and have more children - but the chances of you being taken for a ride or being pushed into a situation too fast are much, much less than that for someone who's never experienced a relationship like the one you're about to leave.
Good on you Lam, your DD is one lucky little girl. She is going to grow up happy and secure, and you might have some rocky times ahead but by god that slightly rocky for now path is the right one.
Tell your family and lean on them. They'll totally be there for you.
He'll be an absolute shit by the way - keep your DD well away from it, grit your teeth, and head down and out (and remember he has absolutely NO rights to see her at all - and if he even hints at it, gloves off and you tell him in no uncertain terms that if he even dares to try you will be asking the police to look into his borther's history. He'll back off).