My husband accusing me of cheating.

Assalamu Alaykum i’m 20 my husband is 28 we’re in a long distance relationship. He just accused me of cheating and wallah I didn’t and I will never. I’m feeling broken, shocked and numb I don’t even know what to say please if anyone was in this situation let me know what happened. Everything is against me and I have no proof that I didn’t cheat and he doesn’t want to believe me. He said if I didn’t explain myself he will divorce me but I told him everything and I don’t have anything else to say. I feel so oppressed and helpless please help me and make duaa for me.