@Crislie P. I would let him know that you need the rent money and understand that he is having a hard time due to losing his job. I would let him know that if he leaves by the end of this month, you will let him out of his lease without charging him a termination fee or ruining his housing history by having to evict him. Hopefully he will take up you up on the offer and move in with a friend or family member.
If he does not accept that the offer then let him know that you will have to file for eviction. Then start the eviction process. If he pays up you can cancel it and then refile again if he stops paying again in the future. If he does not pay immediately then at least you can get him out and find another tenant before he gets more backed up with rent. The more you let it go and allow for delays, the more behind he will get and as the balance grows he won’t be able to catch up. Then you will lose even more rent.