You got three issues going on here. I don't think this is hard to fix.
1. Take a bow. You've approached and dated (3) women seriously. So that's a good thing. You are on the right path. Many young men are chicken clucks, or have an attitude they now "deserve" a wife just because they reach a certain age, even though they can't provide for a family. You are actually in pretty good shape.
2. The moral issue. You absolutely have a right to protect yourself in this day-and-age. If the Novus Ordo hadn't cucked on annulment, we wouldn't be in this situation. In the time of your grandparents, if a woman "was unhappy", and got divorced, she was automatically excommunicated and Catholics would shun her. Catholics would cross the road to avoid her in town. Her chances of getting an annulment were basically zero. Even civilly it might be considered abandonment, and the kids would go with Dad. Catholic "divorce" and annulment (the real thing) were so rare they were basically zero. But you know what happened, and now as a man you have been served a crap sandwich. So.... morally you are duty bound to provide for your wife if you die. Keep the property title in your name, but provide her with a will that automatically transfers the title to her with a stipulation that she is still married to you in the eyes of the Church and State. Morally, you have done your duty. The house your live in with her should be joint title, since by keeping house and raising kids, she's contributing. If for some reason the property is to go to someone else (doesn't sound that way), but assuming it does, then use life insurance to provide for your wife if you die. That's the moral issue.
3. Game. You messed up, but that's ok because that is how your learn. 3 dates is WAY to early to even talk about marriage, let alone get down to the nitty-gritty of property disposal etc.... And really you should never talk about marriage unless she brings it up. Unless she's a wallflower type. This might be a year out, or up to two years. And when you do talk about marriage, just refer to your house as a rental property investment that will provide additional income for the family, and let her know of your plans to buy a family home. And that's it. I doubt she'll know what a title is, but if she enquires, tell her she'll be included in the will. IF she pesters you to be put on the title, Red Flag! Run!. You've got a gold digger.
Basically you sent off a bad vibe and were over eager. That's just inexperience, so learn from it. I went through many an embarrassing time with the young lasses before I was good enough to tame them. You learn by screwing up.
Finally, run this by a lawyer. I believe you don't have to do anything since you acquired the property before marriage. However, ASK A LAWYER. You could look into a trust or some other asset protection method if needed.
And note, I know of multiple cases where an SSPX chick suddenly decided to "regularize" with the diocese and get an annulment, then go to the diocesan TLM. Many Dioceses hand out annulments like a doctor handing out anti-depressents to feminists. Probably most people reading this are aware of at least one case like that, so yes, this is something you have to consider in this day-and-age. Unfortunately. But you can still protect yourself while satisfying your duty to your wife.
