Quite seriously though it is a matter of time, and your relationship can be amazing normally but just not able to weather a storm.
You can just feel it, it's hard to explain. You just know when there's no one you connect on the same levels with and love like you do. But you can tell more if that's the case if you've gotten through tough situations together - test of strength and all that. Tough situations can be very didn't for everyone
My parents are soulmates.