hello, i live in new jersey, i am in a civil partnership. my partner came from canada with nothing, i have been with him from the beginning, he has made alot of money by now, and we have been together for 15+ years, if we split am i entitled of 50 percent of all his assets.

This is a very interesting question that will have to be decided by the Courts.  New Jersey's law on same sex marriages and relationships has changed in the time you have been together.  Therefore, there are a limited group of people that formalized their relationship under the old law, and I do not believe there is any case law on what the same sex partner would be entitled to if that relationship is dissolved.  It i my understanding that the court's are following equitable distribution, but that is uncertain.