Most Helpful Guy
Every experience changes you and there is no guarantee that you'll fit with the person you're with
Most Helpful Girl
The best way I can describe it is as we get older, our interests change. All the things I liked in men at 19 aren't the same things I liked at 22 and so forth. What caught your attn about your s/o in the beginning could be the very thing that you can't stand down the road. As we grow, it's very possible to still love the person you are/we're with, but that passion isn't there anymore.