Passing of family member

I agree with this. I understand why you would want to go to be there for him. But you can be there for him before and after, too. Follow his lead here and it will be fine.

When my fiance's grandma died I never met her he didn't want me to go because he wanted to grieve and he has a hard time letting anyone see him cry I wouldn't take it too harsh

Everyone grieves differently and there could be a multitude of reasons he has stated you don't need to go with him.

When my maternal grandfather passed, (FH was actually the one to deliver the news to me), I had asked him to come to the services with me, I was very close to my Poppy and it was a devastating loss and I needed the comfort of FH to get myself through the day.

A few years later my paternal grandmother passed, though I grew up seeing my grandma and it was sad to lose her, we weren't close and I didn't feel a need for FH to take a day from work to attend the services.

FH could have different reasons for requesting you not go, like mentioned above he may not feel like he can grieve properly with you there. If his request is you not attend, I would respect his wishes.

I wouldn't hold this against him or read too much into it. Maybe he wants to grieve alone. Tell him you'll be available to talk and be there for him in any way he needs.