Is husband entitled to half my house?

My house was an inheiritance from my grandparents, long before I got married. Lawyers have already told me that my husband cannot touch my house when we go for a divorce. But the problem is now, I need to take a loan out on my house to buy a car. If I did this, would he then be entitled to half the house, since we are still legally married? We have no legal separation. He abandoned me and our 17 month old son. If I did this, would he get half the house?