What you are proposing has serious tax implications. Let's look at the most important legal and financial tools that will help protect the three of you. If you put your partner on the deed, you will be making an irrevocable gift. A smarter strategy is to do a property agreement. In it you can address every what if question.
Relationships are about communication, use the agreement to really get know each other.
If you are going to mix money, buy things together, financially support each other, incur debt, a living-together agreement will help. Nolo Press has several books written for you. What if you are hospitalized, can Judith make medical decisions for you or be your advocate. A properly drafted durable power of attorney for your state will enable each of you to make binding decisions for the other one. When you do a DPA makes sure it covers both health care and financial decisions.