NJ-Tenant security deposit question when lease is broken

[Andy S.]

Hello,

My tenant gave me a notice of vacating the property 10 months before the end of lease. In the contract it clearly says tenant is responsible for the rent for the duration of the lease. The reason he provided was that he was buying his own home and hence was moving out. In this case am I required to give him a heads up that he will forfeit the security deposit, or I can just keep the deposit and not refund him anything? What is the best way of handling such a situation? Thanks