Why?

Why do people break up with their partners after so long together? With the exception of the obvious, cheating, abuse etc. How can you be in a relationship for 5+ years and then end it, surely by that point you’ve decided you’re in for the long haul, no?

I’m an incredibly loyal and patient person so I can tolerate a lot of shit and not let it phase me or change my love for someone.

But as someone recently broken up with after 6 years, and having seen lots of similar stories, I just don’t understand how it can take someone so long to work out if you are what they want for life.

It makes me question if most relationships/partnerships are destined for unhappiness. That terrifies me.