i lived with the lady for almost 3 yrs she past away feb 23rd 2023 why do i need to moved with in a month

If you were only a live in partner and not a surviving spouse, there is no right that you have to a life estate in your decedent girlfriend's home. You are now in the status of a tenant on a month to month lease at best and a holdover tenant at worst. Accordingly, you can be evicted without cause. That is the general rule and there are exceptions so you need to contact an attorney in your state to review all the facts to determine what your rights are.