I don't have an experience in this but I do have that fear too, and I ask the same questions all the time. I'm replying on you latest post here: I heard from my recent divorced friend that his wife isn't the same person who married 10 years ago, she like someone else now, but to be honest your age and your partner age play a huge role in this. like if you are let's say 23 years old and you are marrying a 20 years old (at this time with all the social media fantasies) you're both defiantly should be different 10 years from now. Growing up is part of the journey, but how to stay loyal and fight life together is key for this. I feel communicating with the person you want to marry and being honest about your goals, fears etc... is the main thing in any relationship.