I have a tenant who is refusing to pay me rent. He has been late many times and I have always given him time to pay

Customer: Hi,I have a tenant who is refusing to pay me rent. He has been late many times and I have always given him time to pay without issuing and N4. Recently, circumstances in my life changed to where I need to either resume ownership of the property or sell my property to use the money to purchase somewhere else. He recently kicked my other tenant (his girlfriend) who is also on the lease out of the house. (The lease is now month to month).The female tenant called the police and they said they could not resolve the issue so she left the property. I did not know these details until well after the events unfolded. I did know that they had broken up after the sent me rent separately for the first time in june and I had to inquire about a substantial missing portion. The female tenant told me of the breakup and that she was looking for a new place.The rent was never paid in full for June. However, in July they paid the rent together and there was no update on the female tenant moving out. I thought they had reconciled.However, the female tenant notfifed me on July 30th that she would be moving out as of August 1st. On July 30th I spoke to the male tenant to ask him what he intended to do and I let him know that I was considering selling the house. The next day I let him know that I wasn't sure which of two options I would take but I would either be moving back in or selling the house to buy a new place so I was giving him 60 days notice and an offer of $1000 to help secure his next place and I would waive the rent he owed from June. He got angry and said I was trying to illegally evict him. I repeatedly tried to explain this I was making him an offer and that if he needed more time or had an offer in mind that would be more suitable he only needed to ask and if it was reasonable then I would be happy to accommodate.As an aside, we had never had a confrontational relationship and I had never involved the landlord tenant board when he was late with his rent so I didn't think of going that route when I decided I was either going to sell or move back in. I have been recently advised that even if a day late to start the N4 process but until now that had seemed so unkind.Anyway, he said through text and email that he was going to stay in the place and not pay me another cent in rent and that it would drag out for months before there would be a hearing and all that time he will not pay rent and that the covid rules mean he does not have to pay rent. He has threatened to take me to court for unlawful eviction (he has not been evicted). I have filed an N4 and lawfully left it in his mailbox. He has not acknowledged it. The next step will be an L1. In the meantime I'm readying the house for sale. My questions are
1) Can I take him to collections for the rent he owes now?
2) Is there any legal recourse for me since I have in writing that the tenant does not intend to pay me for the forseeable future?