There is nothing inherently illegal about a landlord renting different parts of a structure to different people.

Can I break my lease?

You should inform your property manager of your special health condition and request additional treatments to your unit.

Apt charges was sent to collection, I'm being accountable for all charges when the other two tenants caused damages.

These room mate issues are difficult to deal with. Without seeing the documents or discussing the facts, it is difficult to diagnosis, but here...

Can he change locks/lock her out? Force her to leave because she wont date him? Does he have to follow state eviction process?

If your friend has established residency in the home the owner will need to use the judicial eviction process if he wants to terminate her tenancy....

Am I liable for the rent even after a lease is signed w/new tenants even if they don't end up moving forward w/ their lease?

You may have a reasonable argument that when the landlord signed the lease with the replacement tenants that he terminated your lease. You...

What can I do to get this rodent issue taken care of ?

You may have a Warranty of Habitability defense. But, to perfect this defense you must provide proper notice and opportunity to cure, i.e. access....

Is there a percentage tenants should be discounting from rent or any coverage for property damage/bills when apartment floods?

You should attempt to work out a reasonable deduction with your landlord. You may have a Warranty of Habitability defense which if perfected...

Did property mgr and landlord violate my right by not serving eviction even though I originally agreed to move? damages to me

It appears that you have moved out; thus, the property manager does not need to evict you. As for the Sec. Dep. accounting, yes, generally email...

Can the landlord evict my husband if i'm living here and caring for our two month year old child?

This is an issue of exactly how the lease is written and how strictly the landlord wishes to enforce the lease. Unfortunately, the answer to your...

Can my property management company evict me if I give a two weeks notice ?

From your description your employer is not providing your housing and your employment contract is completely separate from your lease. Thus, your...