A friend of mine borrowed some money to buy a car that was $10,000. They said they would get a loan but failed and was turned down. We've been arguing back and forth and I said it was a gift but did not mean it. He used me for money but we did have an agreement over the internet about a certain amount of money. He said he would pay a phone bill that he ran up in exchange for at least part of that money. He never paid the phone as I did of course. So we've been arguing ever since over texting. Can they be used as legal documents?