1/2 tenants + landlord sign lease, is it binding if tenant 2 has not signed yet? contract not even 24hrs old..

My boyfriend and I are trying to rent a home, he and the landlord have already signed, he has also already given $4000 towards 2 months rent & security deposit. However, they are still waiting for my signature. Turns out the house is a filthy infested death trap. We have to get the hell out of this ASAP!! Is this contract leagally binding if my name is on the lease but I have not signed yet. Also not even 48 hours old. HELP PLLLEEAASSEEE!!??