My best friend restores old cars mostly Mustangs and have a big collection. When ever he gets done restoring them he always give me a key to the car just in case I ever want to drive it (I have 27 keys). I wrecked a 1967 Mustang Shelby GT 500 the other day when I hydroplaned on the freeway when it was raining. I totaled the car and I feel so awful about it. He's not mad or upset at me and told me that he's just glad that I didn't get hurt and that a car is replaceable but a best friend isn't. I offered him cash and to help him restore another one but he refuse to take anything from me. Today he called me and told me to come get any car I want but I just can't do it. He pumped alot of money into that car and I jacked it up. How can I try to pay him back?