I have a 10 year lease on a house, my landlord died recently, he was also my boyfriend. I want to know if the lease is still good. I do pay rent or I did to him but now I am not sure who I am suppose to pay

Escrow the funds until the estate is probated. Is there a will? Executor?

Yes, the lease is still good, provided that you keep current on the lease payments and otherwise honor all the terms of the lease. As ma0641 suggested, you could hold the payments in escrow. If you do that, you should send a written notice of the escrow arrangements to the address at which you previously sent the payments.

Alternatively, you could continue to send the lease checks to the address to which you sent them before. Whoever is entitled to cash them (an executor appointed by the probate court, for example) will cash them in due course.

If the landlord was your boyfriend, don't you know who his heirs are? The lease would have to be honored by the estate. If you can't find who to make payments to, follow the suggestions from the others.