My love. (((hug)))
What a rollercoaster ride! 
Can I ask, what work have you done on yourself to heal and recover from the abusive relationship?
Can you set and maintain boundaries in your life?
Can you be on your own?
Are you 'grateful' he's taken you on, or do you know that he's as lucky to have you as you think you are to have him?
Do you think if he doesn't marry you that there won't be anyone else that asks you?
If you can honestly answer these questions it'll help you see where your insecurities lie.
I worry that the haste with which you started planning the wedding, setting a target of a year, but stating drama-free, and small indicated that you think if you don't marry him quick, he'll change his mind.
Honey, if there's a real risk of that, YOU need to tell him to sling his hook. You are not doing him any favours, he should be as honoured that you are going to marry him as you are him.
If you were chilled and at ease with yourself you would be delighted, but in no rush to marry as you know it will happen one day, or if not that's OK too.
Personally, (I'm a survivor of a DV relationship too) I'd only re-marry if I was 100% sure. I wasn't even married to my abuser, but I still wouldn't rush. I might live with someone, but I have a 6yo, so it'd be a big step to move us both into someone elses life.
If I were you I'd not get too worked up about the proposal just yet, take it as a sign of affection and commitment to you, no more, as indeed there is no movement towards living together. If your guy is thinking 2 year engagement at least, then fine, you have at least a year to see what is what. If you are not moved in together by then.... you'll need to do some thinking. Don't push, let him show YOU how much he wants YOU in his life.
We don't know, you don't know, you could be right and he IS just saying something to keep you on the hook, he might mean it.
He has to show more need/desire to wanting to spend more time with you and your DC, before you can really take his proposal seriously.
Put all thoughts of wedding planning out of your mind for now, perhaps if you back off on that subject, he will realise that he has to get his finger out and make a move towards joining your lives better than it is currently.
If it's meant to be, it will be. Make him chase you a little bit, don't jump to snare him.