How so i help him

So a few months ago my husband was working a night shift in a hotel where he witnessed a girl in a room with 2 men completely naked...when asked to leave the men asked for her to stay because "she had no where to go". When my husband say helium canisters and condoms all over the floor he made her clean up if she wanted to stay, she kept falling all over the place and even went outside to buy more drugs, even saying she didnt have her room key even though cctv shows she did but hid it from my husbands view, anyways he helped her into her room and that was it he came home. Literally 10mins later we get a phone call that she has alleged she raped him.

This girl changed her statement twice saying nothing happened because she said no and then something happened because she said yes and that she fell asleep before and after the rape according to her she was shouting for help but nobody who was in that hotel heard anything from that room.

My husband lost his job because of her he doesnt eat or sleep hes not even allowed home to see his family 😔 hes realesed under investigation because they have no evidence at all to back up what the girl is saying and cctv doesnt see my husband enter that room only the time he told her to clean up.....what do i do how do i help him through this i know he didnt do it but for someone to mess with our lives like that is digusting and i hope she gets charged and put in a mental hospital