Section 8 Tenant stops paying his share

[Nancy Wang]

The tenant didn't pay for July's rent, after 14 day notice and summons paper (another week) he paid for July's rent the day before we would have filed the summary process. He hasn't paid August's rent. We have served him another 14 day notice on Aug 10th. We will probably serve him another summons (he then has another 7 days) before we can file on court. That will be somewhere in September and I am 100% sure he is not going to pay the rent for Sept.

It seems he likes to play this game. My constable told me second time I don't have to accept his rent and start eviction. Is that true that I can evict him by refusing his share of rent on the 14-day notice? 

When is enough is enough?