Torn and confused

I would advise against it, but if you do go through with it, I would make sure that all possibilities for house repairs and unexpected costs are covered in a written agreement before your purchase. I would also put in a clause of some kind in case one of you wants to sell or buy the other one out.
Have you been friends a long time? Just how well do you know and trust this person? Are they reliable? Is there any possibility that either of you may become unemployed and can't meet your financial responsibilities?
Maybe you should speak with a lawyer. Most lawyers give free consultations. They can tell you if you should have a written agreement and what that agreement should cover.

Share the purchase of a house ???

Not wise

I have built 3 new homes & purchased 4 used homes while single.

I sold a house early Dec 24 & purchased a used place last week.

I will renovate it over 2 years & start again. All my close friends are in the building industry so costs are very low for me.

Would I purchase with a friend ====== NO

I'm a firm believer that if you have doubts, don't do it.... Might be time to make a list of your fears and questions and talk through them with her

I wouldn't buy a property with someone else.. can you even trust her to pay her share of the payments? That's a big headache if she is unreliable.. she could be taking advantage of you and give you a lot of grief..

Never. Do not do it no matter what promise was made.

If you feel compelled to do so because of your word, and you won't listen to our advice of not too. Then take you friend to an attorney's office and work out a contract that protects you and her incase one of you defaults and the process to terminate the contract by a buy out or selling of the home.

BIG mistake

Buy a full duplex