Eviction notice - how many times can you send out the notice

[Sada Rafi]

I have a tenant who has been late in payment almost every month. Last month he didn't pay until I sent him Eviction notice (10 days to pay or quit) letter. Then he paid the next day. This month he is late again, so I sent another Eviction notice letter but he is sitting on it and no sign of payment. It has not been10 days yet he has 3 more days to pay or leave. 

My question is what if he pays and repeats same next month? Their lease is good for another 3 months. 

How many times I can send these letters and can I just evict them anyways? I know if they pay, I can't ask them to leave. What is my next step? thanks in advance.