Yes. In the State of NJ most real estate contracts or agreements a spouse enters into also binds the other spouse. However, you may want to have an attorney review it for certainty. Not all buyer's agency agreements are the same. More importantly, if you're unsatisfied with the service the agent is providing you with, you should be able to cancel the agreement. Our version of the BA agreement at Halliburton Homes has an out clause in case the client isn't fully satisfied - for example. We've never had this issue come up, however ;-). Also in our version, when a spouse, relative, or other person you're buying a home with enters into the BA agreement, it binds the other person automatically.
Feel free to reach out to me with further questions on this subject. I specialize in buyer representation and have plenty of experience with BA agreements.
Either way, good luck.