Most, if not, all, people will come along with baggage and be hidden secrets. If someone was open with you that early on, I see it as a sign of honesty and a positive thing, overall. At least you know the bachur is someone who works on himself constantly.
You have to be careful that you are giving up your zivug without being understanding and conscious of the fact that you are not perfect either. The last thing you would want is for Hashem to pass judgement on you for that and replace the zivug with one who you are fooled by and ends up causing you to have a tikkun for passing judgement yourself without allowing Ha’kadosh Baruch Hu to be in control.