If I file for divorce, what happens to my house that I have been living in?

The only way that would happen is if you need to raise money for a property equalization, you have property, your house, which is your separate property. Obtained after separation with your half of the proceeds from selling your prior house. If you have a pension which needs to be divided and you cannot do it any other way you could raise money to equalize the division by selling or borrowing against your house.

If you purchased your current house with only your half of the proceeds of your marital home, there should be no need to divide or sell it. You should consult a family law attorney to review all of the facts and advise you.

You need to talk to an attorney. It's possible you'd keep the house but have to reimburse the community for principal payments. Title needs to be looked at. Could also be that you just get reimbursed for your down payment.

It sounds to me that the house you are currently living in was purchased with your separate property funds which would mean that your husband would not be entitled to an interest therein.