Life insurance beneficiaries receive their benefits outside the will. He need not add anything to the will but you will want to make sure you are a designated beneficiary of his life insurance policy.
He just needs to add you as a beneficiary. However, there are several problems with this. First, he can change the beneficiary at any time. Thus, he can add you now and take you off in 6 monthhs. How are you going to know? Second, he could miss a payment and then the policy would lapse and you would not get any money. Finally, the policy has many exclusions and if one of those exclusions applies, the policy would not pay any money. You may be better off with a judgment against this person.