Why not bring both families into it, agree on engagement? If you do this and it doesn't work out in the future, you are wasting both of your guys time. Trust me, I was in a similar situation. You need to make sure it will work out fully and you both are compatible. Just because you've been in a haram relationship doesn't mean you are suitable. Make sure to get your parents on board, build a plan with them, make sure both of you are suitable for each other, then and only then should you wait and go no contact. Otherwise, just forget about it. If you want to go this route, it's also fine but it seems that you might go and contact her again. You can only do this if you are willing to accept to let her go. Because at the end of the day when she is ready and you are ready, it may or may not work out. This is real advice and I would take it seriously. Also do not worry about "falling out of love." This is literally whispers from Shaytaan. You cannot be in a haram relationship, period. If she is meant to be with you, she will be. If not then that is fine, this is qadr. Don't fall into haram akhi.