You can’t prevent him from making threats, but remedies are available to you if he violates landlord-tenant laws. As llworking pointed out, he can’t take any action at this point. Feb 1 is not 30 days notice to terminate your tenancy assuming it is month-to-month.
Do you intend to stay or do you just need more time?
If you haven’t yet, take a look at ORC 5321 with attention to 5321.16 about security deposits and 5321.17 about termination of tenancy. Also you could read this booklet.

