When is it time to leave?

I have been with my fiance for 3 years now... It has been a crazy rollercoaster and I love him so much.. I know he is committed to me, and he doesn't abuse me or anything, we just fight about the dumbest things all of the time. And I find myself questioning if this is how I want my life to be forever? Is this normal? I know all relationships have their issues but I am just having a hard time knowing how much is too much.