My friend said he won’t pay me because he didn’t have a “good time”

So I’m 19M and my friend is also 19M. We went on a trip recently and I paid for gas and parking, but we agreed he’d pay for half the hotel ($400) basically he said he doesn’t feel obligated because I “neglected” him and made him feel “lonely” when I was with my friends. Do I have a case? I live in Texas and looked it up. I can send a formal demand letter and threaten him with interest and small claims court and wtv. But please let me know if I actually have a case or not please. I have screenshots of him agreeing to pay the agreed upon amount and also screenshots of him deciding that he won’t pay.